CARIBBEAN
EXAMINATIO TION NS
COUNCIL
SECONDARY SECONDAR Y EDUCATIO EDUCATION N CERT CERTIFIC IFICA ATE EXA EX AMI MINA NA TI TION ON PHYSICS
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With the aid of a neat clearly-labelled diagram, describe an experiment to show that when light is reflected from a plane surface the angle of incidence and angle of reflection are equal. ( 8mar ks) (b)
Some Internet Source Providers (companies that provide connection to the Internet and are known as ISP's) communi<:;ate with their customers via line-of-sight microwave links. A microwave antenna at the customer 's premises should be able to 'see' the ISP's antenna in order that customer can carryon two-way communication with the Internet. Consider such a link operating at 2.5 x 109 Hz with 30 km between customer site and ISP antenna.
(i)
What is the wavelength and period of the microwave signal between customer and provider?
(ii)
Calculate in microseconds the time it takes for a signal to travel between customer and provider and back again to customer . Explain why the customer may still have communication unable to see the ISP's antenna d irectly. (The velocity of light C
Draw a clearly-labelled operation.
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and use it to explain the principles of its ( 8 mark s)
(b)
A transformer is used to step down a voltage of 11 KV to 220 V. Given that the transformer has 3200 turns in the primary coil, calculate the number of turns in the secondary coil. ( 4 marks)
(c)
Another transformer is used to further step down 220 V to 110 V. Its input current is 3 A and the output current is 5.6 A. Calculate its efficiency. ( 8 marks)
(ii)
Why the pressure of a gas at constant volume, increases when its temperature is increased . ( 8 mar ks)
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A closed insulated cylindrical tube of inner volume 0.8 m3 is fitted with a heater and piston as shown in Figure 2. The piston may be assumed to have the following pro per ties: it is a perfect heat insulator it slides along the tube without friction its volume is negligible compared with the volume of the tube Initially, the piston of ar ea 100 cm2 is stationary at the centr e of the tube, the heater is OFF and the gas on side A is at 300 K and exerts a pressure of 105 Pa.
(ii)
Deduce (you do not need to calculate) the pr essur e, volume and tem per ature on sid e B, giving reasons f or your answers.
(iii)
Describe what happens to the piston when the heater is turned ON, and also what happens to the pressure of the gas on side B at the same time.
(iv)
After the heater has been on for several minutes the tem perature of the gas on sid e B is now 400k and its volume is 0.2 m3. Calculate the new pressure of the gas on side B. (12 marks)
With the aid of a labelled diagram, describe a simple experiment tank to demonstrate that pressure v aries wIth depth in a fluid. (b)
using a tall, cylindrical ( 8 marks)
An aquarium has a rectangular base that measures 60 cm by 30 cm. Its height is 45 cm and sea water of density 1150 kg/m3 is used to fill it. (i)
Calculate the weight of water in the aquarium and the pressure on a fish at the bottom of the aquarium due to the water alone.
(ii)
Calculate the pressure on a fish at the bottom of the aquarium if atmospheric pressure of 100 kPa acts on the surface of the water . (12 marks)
Copy and complete the following table in your answer booklet . properties of 3 types of radiation
Type of radiation
Charge
Alpha Beta Gamma
Form of energy KE
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The table summarizes the
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A source S emits alpha, beta and gamma radiation. Sketch the path of EACH type of radiation in the region M which has a uniform magnetic field pointing into the plane of the paper . (3 marks)
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C59 29
, D59 30
(ii)
One of these nuclides can be produced from another in the group by radiative emission of an a-particle. Identify the parent and daughter nuclides and give the corresponding nuclear equation.
(iii)
Another of these nuclides can be produced from another member of the group by the r adiation of a beta par ticle. Identify the pair and give the corresponding equation. ( 6 marks)
(d)
Three nuclides X, Y, and Z have half -lives 1 minute, 24 hours and 10 years respectively. Select the nuclide which would be MOST useful as a radioactive tracer in medical diagnosis. Give TWO reasons for your choice.