Maglayo, Ronelle S. Group: 2 Phy13L/B4
Seat No: 7
Analysis Part 1. Inverse Square Law In the r!t part o" the e#per$%ent &here the $n'er!e !(uare la& o" phy!$)! &a! u!e* an* !tu*$e*. It &a! )learly !ho&n "ro% the *ata gathere* that a! the tran!%$ttan)e *e)rea!e!, the *$!tan)e o"
r
al!o *e)rea!e!. It &a! al!o o+!er'e* that a! the l$ght
2
!our)e !our)e %o'e! "arther "arther "ro% "ro% the photo%eter, photo%eter, the &eaer the l$ght l$ght $nten!$t $nten!$ty y $t get!. get!. -he lo&er the tran!%$ttan)e tran!%$ttan)e o" the photo%eter photo%eter the )lo!er the the l$ght !our)e !our)e to +e a+le to get the %a#$%u% l$ght $nten!$ty. $nten!$ty. ! "or the gathere* *ata, the e#per$%ental e#per$%ental &a! )o%pare* to the a)tual
r
2
r
2
g$'$ng only a per)ent error error o" le!! an a'erage le!!
than 0.
Part 2. Polarization In the !e)on !e)on* * part part o" the e#per e#per$%e $%ent nt &her &here e polar polar$a $at$o t$on n &a! per"or per"or%e* %e*,, the $n*$)ator o" l$ght &a! o+!er'e* &$th *$erent: o+!er'at$on at *egree!, *egree!, o+!er'at$on at *egr *egree! ee! an* o+!er' o+!er'at$ at$on on a! polar polar$e $er! r! are are rotat rotate*. e*. ! o+!er o+!er'e* 'e*,, $n the o+!er'at$on at *egree!, the $n*$)ator o" l$ght ha! the !a%e +r$ghtne!! an* )olor. -he o+!er'at$on at *egree! &a! the $n*$)ator o" l$ght o" !our)e 2 $! +r$ghter )o%pare* to the l$ght !our)e. La!tly, the o+!er'at$on a! polar$er! are rotate* &a! that the $n*$)ator o" l$ght !our)e 1 get! *$%%er a! angle *$eren)e approa)he! *egr *egree ee!. !. S$n) S$n)e e the the appa appara ratu tu! ! u! u!e* e* &a! &a! 'ery 'ery a))u a))ura rate te,, a! per" per"or or%e %e*, *, the the e#per$%ental
∅
)o%pare* to the a)tual
∅
ga'e a per)ent error. -he re!ult!
!ho&e !ho&e* * u! that that a! the tran! tran!%$t %$ttan tan)e )e 'alue 'alue )o%e! )o%e! neare nearerr to ero ero *egre *egree, e, the '$!$+$l$ty +e)o%e! +r$ghter an* the 'alue +e)o%e nearer to 10 $nten!$ty. In *egree!, $t +e)a%e *arer. It !ho&e* that a! the angle $n)rea!e! the +r$ghtne!! o"
l$ght *e)rea!e!. n* !o, the relat$on!h$p o" the angle an* the tran!%$ttan)e 'alue $! $n'er!ely proport$onal. ! "or the !our)e o" error, one %a$n !our)e $! the $na))ura)y an* $%pre)$!e rea*$ng o" the *egree o" +r$ghtne!! on the orange $n*$)ator $n the photo%eter. It )ontr$+ute* greatly "or the !our)e! o" error +e)au!e th$! &$ll $n*$)ate ho& "ar %u!t the !e)on* !our)e
r
2
, to +e lo)ate* an* the angle o" polar$at$on.
Conclusion 5#per$%ent No. 46: Photo%etry &a! all a+out to "a%$l$ar$e the !tu*ent! &$th +a!$)! o" photo%etry, to e#plore the pheno%enon o" $n'er!e !(uare la& an* to e#plore the pheno%enon o" polar$at$on. Photo%etry $! the !tu*y o" '$!ual ra*$at$on or the '$!ual !pe)tru% o" l$ght. In !o%e )a!e!, ho&e'er, $t al!o $n'ol'e! the %ea!ure%ent o" near $n"rare* an* near ultra'$olet. Photo%etry $n'ol'e! the )al)ulat$on an* %ea!ure%ent o" lu%$nou! $nten!$ty, lu%$nou! u#, $llu%$nat$on, an* other photo%etr$) (uant$t$e!. In'er!e8!(uare la& $! any phy!$)al la& !tat$ng that a !pe)$e* phy!$)al (uant$ty or $nten!$ty $! $n'er!ely proport$onal to the !(uare o" the *$!tan)e "ro% the !our)e o" that phy!$)al (uant$ty. Polar$at$on, property o" )erta$n ele)tro%agnet$) ra*$at$on! $n &h$)h the *$re)t$on an* %agn$tu*e o" the '$+rat$ng ele)tr$) el* are relate* $n a !pe)$e* &ay. L$ght &a'e! are tran!'er!e: that $!, the '$+rat$ng ele)tr$) 'e)tor a!!o)$ate* &$th ea)h &a'e $! perpen*$)ular to the *$re)t$on o" propagat$on.
9or th$! e#per$%ent, $t helpe* %e un*er!too* +etter the In'er!e8!(uare La& +e)au!e o" &hat I !a& o" ho& the l$ght $nten!$ty *$er "or a )erta$n &$ll g$'e you *$erent
r
2
r
1
that
"or e'ery *$erent tran!%$ttan)e. It &a! !ho&n
that a! tran!%$ttan)e *e)rea!e!,
r
2
al!o *e)rea!e!. -h$! e#per$%ent al!o
helpe* %e un*er!too* ho& to per"or% polar$at$on an* that $t !ho&e* that a! the angle $n)rea!e! the +r$ghtne!! o" l$ght *e)rea!e!. n* !o, the relat$on!h$p
o" the
angle
an*
the tran!%$ttan)e
'alue $! $n'er!ely
proport$onal. ! "or the appl$)at$on $n real l$"e, polar$e* !ungla!!e! &ere %a*e. L$ght ree)te* "ro% !ur"a)e! !u)h a! a at roa* or !%ooth &ater generally $! hor$ontally polar$e*. -h$! )reate! an annoy$ng an* !o%et$%e! *angerou! $nten!$ty o" l$ght that &e e#per$en)e a! glare.
