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AP Exam
AP Unit 10: Waves and Sound – HW (What is the sequence of activities, learning experiences, etc, that will lead to desired results (the plan)? Day In Class work Homework Due that day Notes: Wave motion and Monday, 3/21 1-10 interference Tuesday, 3/22
Labs: Waves on a String
11-19
Wednesday, 3/23
Notes: Standing Waves (string)
20-27
Thursday, 3/24
Work Day
28-30
Waves on a String Lab Due
Monday, 3/28
Notes: Sound Waves (tubes)
31-48
MP Waves Due Online 11pm
Tuesday, 3/29
Labs Waves on a snake
49-55
Wednesday, 3/30
Practice Ranking Task
56-66
MP Sound Due Online 11pm
Thursday, 3/31
Practice Practice Test
Work on MC Questions
Waves on a Snake Lab Due
Friday, 4/1
Test
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Waves 1. Problem 15.14 A sinusoidal wave travels with speed 250m/s . Its wavelength is 5.0m . What is its frequency? (50Hz)
2. Problem 15.18 The figure is a snapshot graph of a wave at t=0s. A. What is the amplitude of this wave? B. What is the wavelength of this wave? C. What is the frequency of this wave? (2Hz)
3. Problem 15.19 The figure is a history graph at x=0m of a wave moving to the right at 2.0 m/s. A. What is the amplitude of this wave? B. What is the frequency of this wave? C. What is the wavelength of this wave? (1.2m)
4. Problem 15.22 People with very good pitch discrimination can very quickly determine what note they are listening to. The note on the musical scale called C6 (two octaves above middle C)has a frequency of 1050 Hz. Some trained musicians can identify this note after hearing only 12 cycles of the wave. How much time does this correspond to? (0.114s)
5. MC 15.23 A sinusoidal wave traveling on a string has a period of 0.22s , a wavelength of 33cm , and an amplitude of 4.0cm . What is the speed of this wave? A. 8.3cm/s 2|Page
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B. 18cm/s C. 150cm/s D. 300cm/s
6. Problem 15.63 Low-frequency vertical oscillations are one possible cause of motion sickness, with 0.30 Hz having the strongest effect. Your boat is bobbing in place at just the right frequency to cause you the maximum discomfort. The water wave that is bobbing the boat has crests that are 30m apart. What is the speed of the waves? (9m/s)
7. Problem 15.3 The back wall of an auditorium is 28.0m from the stage. If you are seated in the middle row, how much time elapses between a sound from the stage reaching your ear directly and the same sound reaching your ear after reflecting from the back wall? The speed of sound in the air is 343 m/s.
8. 15.15 The motion detector used in a physics lab sends and receives 36kHz ultrasonic pulses. A pulse goes out, reflects off the object being measured, and returns to the detector. The lab temperature is 20∘C. A. What is the wavelength of the waves emitted by the motion detector? (9.5mm) B. How long does it take for a pulse that reflects off an object 3.0m away to make a round trip? (17.5 ms)
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9. Problem 15.23 A dolphin emits ultrasound at 100kHz and uses the timing of reflections to determine the position of objects in the water. What is the wavelength of this ultrasound? Assume that temperature of water is 20∘C. (1.48cm)
10. Problem 15.62 The figure shows two snapshot graphs taken 10ms apart, with the blue curve being the first snapshot. A. What is the wavelength of this wave? B. What is the speed of this wave? C. What is the frequency of this wave? (8.33Hz) D. What is the amplitude of this wave?
Waves 2 11. Problem 15.26 Research vessels at sea can create images of their surroundings by sending out sound waves and measuring the time until they detect echoes. The image of a shipwreck on the ocean bottom shown in was made from the surface with 600kHz ultrasound. A. What was the wavelength? Use values given in if necessary.(2.5mm) B. How deep is the shipwreck if echoes were detected 0.42s after the sound waves were emitted? (310.8m)
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12. Problem 16.1 The figure is a snapshot graph at t = 0 s of two waves on a taut string approaching each other at 1 m/s. Select six snapshot graphs, stacked vertically, showing the string at 1 s intervals from t = 1 s to t = 6 s.
1
5
2
6
t=1s: t=2s: t=3s: t=4s: t=5s: 3
7
t=6s:
4
13. Radio station WKLB in Boston broadcasts at a frequency of 99.5 MHz. What is the wavelength of the radio waves emitted by WKLB? Remember that radio waves are electromagnetic in nature. (3.02m)
14. Harriet is told by her doctor that her heart rate is 70 beats per minute. If Harriet’s average blood flow in the aorta during systole is 1.5 x 10-2 m/s, what is the wavelength of the waves of blood in Harriet's aorta, created by her beating heart? (0.129m)
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15. While flying to Tucson, Connie's plane experiences turbulence that causes the coffee in her cup to oscillate back and forth 4 times each second. If the waves of coffee have a wavelength of 0.1 meters, what is the speed of a wave moving through the coffee? (0.4m/s)
16. A fisherman noticed that a float makes 30 oscillations in 15 seconds. The distance between two consecutive crests is 2 m. What is the period and frequency of the wave? What is the wave speed?
17. What is the wave speed if the period is 4.0 seconds and the wavelength is 1.8 m? (0.45m/s)
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18. What is the frequency of a wave traveling with a speed of 1.6 m/s and the wavelength is 0.50 m? (3.2Hz)
19. What is the wavelength of a wave traveling with a speed of 3.0 m/s and the period of 6.0 s? (9m)
Waves 3 20. A fisherman noticed that a wave strikes the boat side every 5 seconds. The distance between two consecutive crests is 1.5 m. What is the period and frequency of the wave? What is the wave speed?
21. What is the wave speed if the period is 7.0 seconds and the wavelength is 2.1 m? (0.3m/s) AP Physics 1: 2015-2016
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22. What is the period of a wave traveling with a speed of 20 m/s and the wavelength is 4.0 m? (0.2s)
23. What is the wavelength of a wave traveling with a speed of 6.0 m/s and the frequency of 3.0 Hz? (2m)
24. A “snapshot” of a wave is given to the right. The frequency of oscillations is 240 Hz. a. What is the amplitude of the wave? b. What is the wavelength of the wave? c. What is the wave speed? d. What is the wave period?
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25. A
“snapshot” of a wave is given below. The frequency of oscillations is 120 Hz. a. What is the amplitude of the wave? b. What is the wavelength of the wave? c. What is the wave speed?(840m/s) d. What is the wave period?(0.0083s)
e. 26. A “snapshot” of a wave is given below. The frequency of oscillations is 160 Hz. a. What is the amplitude of the wave? b. What is the wavelength of the wave? c. What is the wave speed?(240m/s) d. What is the wave period?(0.0625Hz)
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27. A “snapshot” of a wave is given to the right. The frequency of oscillations is 100 Hz. a. What is the amplitude of the wave? b. What is the wavelength of the wave? c. What is the wave speed?(300m/s) d. What is the wave period?(0.01s)
Standing Waves 28. Problem 16.9 A 1.3m -long string is fixed at both ends and tightened until the wave speed is 20m/s . What is the frequency of the standing wave shown in the figure? (46Hz)
29. MC 16.25 The frequency of the lowest standing-wave mode on a 1.0-m-long string is 40Hz . What is the wave speed on the string? (80m/s)
30. Problem 16.11 A bass guitar string is 89cm long with a fundamental frequency of 30Hz . What is the wave speed on this string? (53.4m/s)
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Standing waves 31. Problem 16.16 A violin string has a standard length of 32.8 cm. It sounds the musical note A (440 Hz) when played without fingering. How far from the end of the string should you place your finger to play the note C (523 Hz)?
32. Problem 16.18 An experimenter finds that standing waves on a string fixed at both ends occur at 24Hz and 32Hz , but at no frequencies in between. A. What is the fundamental frequency? B. Select the standing-wave pattern for the string at 32Hz . A D
B
E
C
F
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33. 16.10 The figure shows a standing wave oscillating at 100 Hz on a string. What is the wave speed? (40m/s)
34. Problem 16.22 The figure shows a standing sound wave in an 80cm-long tube. The tube is filled with an unknown gas. What is the speed of sound in this gas? (400m/s)
35. A string with a linear density of 8.0 g/m (0.008 kg/m) is under tension of 200 N. What is the speed of the wave? (158m/s)
36. A wave speed in a piano string of linear density 5.0 g/m (0.005 kg/m) is 140 m/s. What is the tension in the string? (98N)
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37. A wire with a linear density of 15 g/m (0.015 kg/m) undergoes a tension force of 250 N. A transverse wave with a wavelength of 0.40 m is produced in the wire. What is the wave speed? What is the frequency of oscillations? (129m/s, 323Hz)
38. A string with a linear density of 4.0 g/m (0.004 kg/m) is under tension of 150 N. What is the speed of the wave? (194m/s)
39. A wave speed in a guitar string of linear density 9.0 g/m (0.009 kg/m) is 160 m/s. What is the tension in the string?(230N)
40. A guitar string with a linear density of 25 g/m (0.025 kg/m) undergoes a tension force of 400 N. A transverse wave with a wavelength of 0.80 m is produced in the wire. What is the wave speed? What is the frequency of oscillations? (126m/s, 158Hz)
Standing Waves 41. A guitar string vibrates with a fundamental frequency of 330 Hz. What are the frequencies of first four harmonics?
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42. A stretched wire resonates in three loops at a frequency of 180 Hz. What are the first four harmonics?
43. A stretched wire with a length of 2.0 m resonates in two loops. The wave speed is 120 m/s. What is the wavelength? What are the first three harmonics?
44. A violin string vibrates with a fundamental frequency of 450 Hz. What are the frequencies of first four harmonics?.
45. A piano string resonates in five loops at a frequency of 250 Hz. What are the first four harmonics?
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46. A violin string with a length of 0.50 m resonates in five loops. The wave speed is 200 m/s. What is the wavelength? What are the first three harmonics? (0.2m, 1600Hz, 3200Hz, 4800Hz)
47. A string with a length of 2.5 m resonates in five loops as shown above. The string linear density is 0.05 kg/m and the suspended mass is 0.5 kg. a. What is the wavelength? b. What is the wave speed? (9.9m/s) c. What is the frequency of oscillations? (9.89Hz) d. What will happen to the number of loops if the suspended mass is increased?
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48. A string with a length of 2 m resonates in three loops as shown above. The string linear density is 0.03 kg/m and the suspended mass is 1.2 kg. a. What is the wavelength? b. What is the wave speed?(19.8m/s) c. What is the frequency of oscillations? (14.8) d. What will happen to the number of loops if the suspended mass is increased?
Waves in a Tube 49. Conceptual Question 15.18 You are standing at x=0m, listening to seven identical sound sources described by the figure. At t=0s, all seven are at x=343m and moving as shown below. The sound from all seven will reach your ear at t=1s. Rank in order, from highest to lowest, the seven frequencies f1 to f7 that you hear at t=1s.
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50. Problem 16.20 The lowest frequency in the audible range is 20 Hz. A. What is the length of the shortest open-open tube needed to produce this frequency?(8.55m) B. What is the length of the shortest open-closed tube needed to produce this frequency?(4.3m)
51. Multiple Choice Question 15.25 You stand at x = 0 m, listening to a sound that is emitted at frequency f0. The figure shows the frequency you hear during a four-second interval. Which of the following describes the motion of the sound source? A. It moves from left to right and passes you at t = 2 s. B. It moves from right to left and passes you at t = 2 s. C. It moves toward you but doesn't reach you. It then reverses direction at t = 2 s. D. It moves away from you until t = 2 s. It then reverses direction and moves toward you but doesn't reach you.
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52. Problem 16.24 An organ pipe is made to play a low note at 27.5 Hz, the same as the lowest note on a piano. A. Assuming a sound speed of 343 m/s, what length open-open pipe is needed? (6.24m) B. What length open-closed pipe would suffice? (3.12m)
53. Problem 16.21 The contrabassoon is the wind instrument capable of sounding the lowest pitch in an orchestra. It is folded over several times to fit its impressive 18ft length into a reasonable size instrument. A. If we model the instrument as an open-closed tube, what is its fundamental frequency? The sound speed inside is 350m/s because the air is warmed by the player's breath. (15.9Hz) B. The actual fundamental frequency of the contrabassoon is 27.5Hz , which should be different from your answer in part A. This means the model of the instrument as an open-closed tube is a bit too simple. But if you insist on using that model, what is the "effective length" of the instrument? (10.4 ft)
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54. MC 16.24 Resonances of the ear canal lead to increased sensitivity of hearing, as we've seen. Dogs have a much longer ear canal - 5.2 cm - than humans. What are the two lowest frequencies at which dogs have an increase in sensitivity? The speed of sound in the warm air of the ear is 350 m/s. A. 1700 Hz, 3400 Hz B. 3400 Hz, 6800 Hz C. 1700 Hz, 5100 Hz D. 3400 Hz, 10,200 Hz
General Problems 55. Problem 16.28 Some pipe organs create sounds lower than humans can hear. This "infrasound" can still create physical sensations. Assume a sound speed of 343 m/s. A. What is the fundamental frequency of the sound from an open-open pipe that is 32 feet long (a common size for large organs; 1 ft = 0.305 m)?(17.6Hz) B. What length open-closed tube is necessary to produce this note? (4.87m)
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56. An orchestra tunes up for the big concert by playing an A, which resounds with a fundamental frequency of 440 Hz. Find the first and second overtones of this note. What are the second and third harmonics of the A?
57. In his physics lab, Sanjiv finds that he can take a long glass tube and fill it with water using the air space of the top to simulate a pipe closed at one end. If Sanjiv holds a tuning fork, which vibrates with a fundamental frequency of 440 Hz, over the mouth of the pipe, how long is the air column if it vibrates at the same frequency? (0.193m)
58. Melody puts a fret on her guitar string, causing it to vibrate with a fundamental frequency of 250 Hz as a wave travels through at 350 m/s. (A) How long is the guitar string from the lower fixed end to the fret? (0.7m) (b) How far and in which direction must the fret be moved in order to produce a fundamental frequency that is twice as high (i.e., one octave higher)?(0.35m shorter)
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59. Walter is a bass and can hit a low E that has a frequency of 82.4 Hz. Millie is a soprano and can sing as high as the third overtone of this note. What is the highest frequency that Millie can sing? Which harmonic would this be?
60. Joyce, the church organist, is practicing on the organ and she finds that the first two overtones for the 370 Hz pipe are 1110 Hz and 1850 Hz. Is the organ pipe closed at one end or open at both ends? How do you know this?
61. A train passes through a tunnel that is 550 meters long. What is the fundamental frequency of vibrating air in the tunnel? (0.31Hz)
62. Harvey, a harpist, plucks a 0.600 m long string on his harp. The string has a first overtone of 1046.6 Hz. How fast does the vibration move through the string?(628Hz)
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63. A group of students in a physics lab perform a series of experiments with a set of tubes and tuning fork. In the first trial they use a tube which length can be extended. The length of the tube when sound resonates for the first time is 0.5 m. (Vsound = 340 m/s) a) Determine the wavelength of the sound wave. (1m) b) Determine the frequency of the tuning fork. (340Hz)
In the second trial the students use a tube with a constant length but they place in the tube a cork stopper with the same diameter as the inner size of the tube. The cork can freely move from the left side of the tube to the right. The frequency of the tuning fork stays the same as it was determine in the first trial. c) Determine the minimum length L0 of the left side of the tube when the air column resonates for the first time. (0.25m) d) What is the length L of the tube when the air column resonates for the second time? third time?(0.75m, 1.25m)
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64. 4. A group of students in a physics lab perform a series of experiments with a set of tubes and tuning forks. In the first trial, they use a tube whose length can be extended. The length of the tube when sound resonates for the first time is 1.0 m. (vsound = 340 m/s) a. Determine the wavelength of the sound wave. (2m) b. Determine the frequency of the tuning fork. (170Hz)
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In the second trial, the students use a tube with a constant length, but they place in the tube a cork stopper with the same diameter as the inner size of the tube. The cork cn freely move from the left side of the tube to the right. The frequency of the tuning fork stays the same as it was determined in the first trial. c. Determine the minimum length LO of the left side of the tube when the air column resonates for the first time. (0.5m) d. What is the length L of the tube when the air column resonates for the second time? Third time? (1.5m, 2.5m)
65. You are in the physics lab with a hollow tube, open at both ends, with an adjustable length. You are also given an adjustable speaker that can produce a single tone at a time. The frequency produced is also shown on the speaker. You are told to use the tube to find the speed of sound in the room. a. Describe how you would perform you experiment. Make sure to include what measurements you would make. b. Describe how you would use those measurements to calculate the speed of sound. c. A student doing a different experiment measures the following periods and wavelengths. Graph the data below to calculate the speed of sound. Period 0.003s 0.004s 0.005s 0.007s
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Wavelength 1.0m 1.5m 1.7m 2.5m
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Waves Multiple Choice 1. The distance traveled by a wave in one period is called? A. Frequency B. Period C. Speed of wave Amplitude
D. Wavelength
E.
2. Which of the following is the speed of a wave traveling with a wavelength λ, frequency f, and period T? 𝜆 𝑓 𝑓 A. v = 𝑓 B. v =𝜆 C. v = λ·f D. v = f·T E. v = 𝑇 3. The frequency of a wave is doubled when the wavelength remains the same. What happens to the speed of the wave? A. It doubles B. It quadruples C. Remains unchanged D. It is cut to one-half E. It is cut to one-fourth 4. The frequency of a wave increases when the speed remains the same. What happens to the distance between two consecutive crests? A. It increases B. It decreases C. Stays unchanged D. It increases first and then decreases E. It decreases first and then increases 5. Which of the following statements is true about transverse waves? A. They always have the same frequencies B. They always have the same velocities C. They always have the same wavelengths D. They always travel through a dense medium E. The particles vibrate in perpendicular direction with respect to the wave motion 6. Which of the following statements is true about longitudinal waves? A. They always have the same frequencies B. They always have the same velocities C. They always have the same wavelengths D. They always travel through a dense medium E. The particles vibrate along the same direction as the wave motion 7. A wave travels on a string of length L, linear density µ, and tension T. Which of the following is true? A. The wave speed is inversely proportional to the tension T B. The wave speed is directly proportional the linear density µ C. The wave speed increases with increasing tension T D. The wave speed increases with increasing linear density E. The wave speed only depends on the length of the string
8. A wave pulse travels a long a thin part of a horizontal cord and reaches another part of the cord which is much thicker and heavier. Which of the following is true about the reflected and transmitted pulse by the boundary in the cord? Reflected pulse Transmitted pulse A. Upright Upright 26 | P a g e
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B. Inverted C. Upright D. Inverted E. Zero amplitude
Inverted Inverted Upright Zero amplitude
9. A wave pulse travels a long a thick part of a horizontal cord and reaches another part of the cord which is much thinner and lighter. Which of the following is true about the reflected and transmitted pulse by the boundary in the cord? Reflected pulse Transmitted pulse A. Upright Upright B. Inverted Inverted C. Upright Inverted D. Inverted Upright E. Zero amplitude Zero amplitude
10. Two wave pulses with equal positive amplitudes travel on a cord approaching each other. What is the result of the oscillations when the pulses reach the same point? A. It is constructive interference with twice the amplitude B. It is destructive interference with zero amplitude C. It is constructive interference with slightly greater amplitude D. It is constructive interference with the negative amplitude E. The standing wave is produced
11. Two wave pulses one with a positive amplitude the other with equal negative amplitude travel on a cord approaching each other. What is the result of the oscillations when the pulses reach the same point? A. It is constructive interference with twice the amplitude B. It is destructive interference with zero amplitude C. It is constructive interference with slightly greater amplitude D. It is constructive interference with the negative amplitude E. The standing wave is produced
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A “snapshot” of a wave at a given time is presented by the graph to the right. Use this graph for questions 12 and 13. 12. What is the amplitude of oscillations? A. 0.5 cm B. 1 cm E. 20 cm 13. What is the wavelength of the wave? A. 0.5 cm B. 1 cm
C. 2 cm
D. 5 cm
C. 2 cm
D. 5 cm
E. 20 cm
A “snapshot” of a wave at a given time is presented by the graph to the right. Use this graph for questions 14 and 15. 14. What is the amplitude of oscillations? A. 1 cm B. 2 cm C. 4 cm E. 8 cm
D. 6 cm
15. What is the wavelength of the wave? A. 1 cm B. 2 cm C. 4 cm E. 8 cm
D. 6 cm
16. A stretched string of length L = 2 m resonates in two loops. What is the wavelength of the wave? A. 1 m B. 2 m C. 3 m D. 4 m E. 6 m 17. A stretched string of length L = 6 m resonates in three loops. What is the wavelength of the wave? A. 1 m B. 2 m C. 3 m D. 4 m E. 6 m
18. A stretched string of length 8 m vibrates at a frequency of 50 Hz producing a standing wave pattern with 4 loops. What is the speed of wave? A. 50
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𝑚 𝑠
B. 100
𝑚 𝑠
C. 150
𝑚 𝑠
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D. 200
𝑚 𝑠
E. 250
𝑚 𝑠
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19. A guitar string resonates at a frequency of 500 Hz forming a standing wave pattern with 5 loops. What is the fundamental frequency? A. 100 Hz B. 200 Hz C. 300 Hz D. 400 Hz E. 500 Hz 20. A guitar string resonates at a fundamental frequency of 300 Hz. Which of the following frequencies can set the string into resonance? A. 30 Hz B. 100 Hz C. 400 Hz D. 500 Hz E. 600 Hz
Sound Waves Multiple Choice 1. Two sound sources S1 and S2 produce waves with frequencies 1000 Hz and 500 Hz. When we compare the speed of wave 1 to the speed of wave 2 the result is: (A) Twice as great (B) One-half as great (C) The same (D) Four times great (E) One-fourth as great 2. Which of the following is a true statement about the speed of sound in three different materials: air, water, and steel? (A) Vair > Vwater > Vsteel (D) Vair < Vwater > Vsteel (B) Vair > Vwater = Vsteel (E) Vair < Vwater < Vsteel (C) Vair = Vwater < Vsteel 3. A sound source S radiates a sound wave in all directions. The relationship between the distances is SA = AB = BC = CD. Which of the following points oscillates at the highest frequency? (A) Point A (B) Point B (C) Point C (D) Point D (E) All points have the same frequency 4. The loudness of a sound wave increases with increasing which of the following: (A) Frequency (B) Amplitude (C) Period (D) Wavelength (E) Speed of sound 5. A sound wave travels from air into water. Which of the following doesn’t change? (A) Frequency (B) Amplitude (C) Speed of Particles (D) Wavelength (E) Speed of sound 6. A sound wave resonates in a tube with two open ends and a length L. What are the wavelengths of the three lowest resonating frequencies generated in the tube? (A) L, 2L, 3L (B) 2L, L, 2L/3 (C) L/2, L/3, L/5 D) L/3, L/5, L/7 (E) 4L, 4L/3, 4L/5 7. The lowest frequency in an open tube is 250 Hz. What are the three following frequencies that will resonate in the tube? (A) 500Hz, 750Hz, 1000Hz (B) 100Hz, 200Hz, 400Hz (C) 250Hz, 500Hz, 750Hz (D) 150Hz, 450Hz, 850Hz (E) 50Hz, 100Hz, 150Hz
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8. The lowest frequency in an open tube is 100 Hz. Which of the following frequencies will resonate in the tube? (A) 25Hz (B) 50Hz (C) 150Hz (D) 200 Hz (E) 250Hz Use the diagram to the right to answer questions 9 and 10. 9.
A sound wave resonates in an open pipe with a length of 1 m. What is the wavelength of the wave? (A) 0.5 m (B) 1.0 m (C) 1.5 m (D) 2.0 m (E) 2.5 m
10. A sound wave resonates in an open pipe with a length of 2 m. What is the resonating frequency? (Vsound = 340 m/s) (A) 85 Hz (B) 170 Hz (C) 340 Hz (D) 510 Hz (E) 680 Hz
Use the diagram to the right to answer questions 11 and 12. 11. A sound wave resonates in an open pipe with a length of 6 m. What is the wavelength of the wave? (A) 1.5 m (B) 2.0 m (C) 3.0 m (D) 4.0 m (E) 6.0 m 12. A sound wave resonates in an open pipe with a length of 1.5 m. What is the resonating frequency? (Vsound = 340 m/s) (A) 85 Hz (B) 170 Hz (C) 340 Hz (D) 510 Hz (E) 680 Hz 13. A sound wave resonates in a tube with one open end and a length L. What are the wavelengths of the three lowest resonating frequencies generated in the tube? (A) L, 2L, 3L (B) L, 2L, 2L/3 (C) L/2, L/3, L/5 (D) L, 3L, 5L (E) 4L, 4L/3, 4L/5 14. The lowest frequency in a closed tube is 200 Hz. What are the three following frequencies will resonate in the tube? (A) 600Hz, 1000Hz, 1400Hz (B) 100Hz, 200Hz, 400Hz (C) 400Hz, 600Hz, 800Hz (D) 900Hz, 1500Hz, 2100Hz (E) 50Hz, 100Hz, 150Hz 15. The lowest frequency in a closed tube is 300 Hz. Which of the following frequencies will resonate in the tube? (A) 900Hz (B) 1000Hz (C) 1200Hz (D) 2500 Hz (E) 3000Hz 16. Two sound sources generate pure tones of 500 Hz and 525 Hz. What is the beat frequency? (A) 5Hz (B) 10Hz (C) 15Hz (D) 20Hz (E) 25Hz 17. A sound wave resonates in a closed pipe with a length of 3.0m. What is the wavelength of the wave? (A) 1.5 m (B) 2.0 m (C) 3.0 m (D) 4.0 m (E) 6.0 m
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18. A sound wave resonates in a closed pipe with a length of 3.5 m. What is the wavelength of the wave? (A) 1.5 m (B) 2.0 m (C) 2.5 m (D) 3.0 m (E) 6.0 m 19. A sound wave resonates in a closed pipe with a length of m. What is the resonating frequency? (Vsound = 340 m/s) (A) 85 Hz (B) 170 Hz (C) 340 Hz (D) 510 Hz (E) 680 Hz
2.5
20. Two sound sources produce waves with slightly different frequencies. What happens with the beat frequency if the frequency of the lowest tone increases and passed the higher tone? (A) Increases (D) Increases and then decreases (B) Decreases (E) Decreases and then increases (C) Stays the same
AP Physics 1: 2015-2016
10 – Waves and Sound
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Mastering Physics: Sound
Name:
Due Online: Wednesday, March 30, 2016 11pm Due Work: (next school day) Thursday, March 31, 2016
Period:
Problem 16.23 A. What are the three longest wavelengths for standing sound waves in a _________-long tube that is open at both ends?
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B. What are the three longest wavelengths for standing sound waves in a _________tube that is open at one end, closed at the other?
Problem 16.29 Although the vocal tract is quite complicated, we can make a simple model of it as an open-closed tube extending from the opening of the mouth to the diaphragm, the large muscle separating the abdomen and the chest cavity. A. What is the length of this tube if its fundamental frequency equals a typical speech frequency of _________? Assume a sound speed of _________.
B. Does this result for the tube length seem reasonable, based on observations on your own body? Yes or No?
Multiple Choice Question 16.22 A student in her physics lab measures the standing-wave modes of a tube. The lowest frequency that makes a resonance is _______ Hz . As the frequency is increased, the next resonance is at _______ Hz . What
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Problem 16.26 Parasaurolophus was a dinosaur whose distinguishing feature was a hollow crest on the head. The _______- long hollow tube in the crest had connections to the nose and throat, leading some investigators to hypothesize that the tube was a resonant chamber for vocalization. If you model the tube as an open-closed system, what are the first three resonant frequencies? Assume a speed of sound of _______ m/s.
AP Physics 1: 2015-2016
10 – Waves and Sound
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Mastering Physics: Waves
Name:
Due Online: Monday, March 28, 2016 11pm Due Work: (next school day) Tuesday, March 29, 2016
Period:
Problem 15.13 A sinusoidal wave has period _________and wavelength _________. What is the wave speed?
Problem 15.8 A stationary boat in the ocean is experiencing waves from a storm. The waves move at _________h and have a wavelength of _________. The boat is at the crest of a wave. How much time elapses until the boat is first at the trough of a wave?
Multiple Choice 16.18 Refer to the snapshot graph. At t = 1s , what is the displacement y of the string at x = 7cm ?
Problem 16.13 A. What are the three longest wavelengths for standing waves on a _________-long string that is fixed at both ends?
B. If the frequency of the second-longest wavelength in part a is _________, what is the frequency of the third-longest wavelength?
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AP Physics 1: 2015-2016
