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Physics 2C Summer Session I
Quiz #4
Multiple Choice. Choose the answer that best completes the
statement or answers the question.
1. From the law of Malus
S=S
0
= cos
2
Hence for four polarizers each of
which has an angle of
=
±=
8
we have
S=S
0
= cos
2
=
cos
2
±=
8
±
4
=
:
531 (
A
)
30
:
Hence the ray is rotated
through
300
600
360
=
240
(
D
)
:
3. The wavelength for a
6
:
40
±
10
14
Hz
spectral line is
²
=
c=f
= 3
±
10
8
=
6
:
40
±
10
14
= 469
nm:
The expression for the Doppler e/ect for light that
is redshifted is
²
obs
=
²
emit
s
1 +
v=c
1
v=c
!
²
²
obs
²
emit
³
2
=
1 +
v=c
1
v=c
1 +
v
c
=
(
²
obs
=²
emit
)
2
´
1
v
c
µ
v
c
´
(
²
obs
=²
emit
)
2
+ 1
µ
=
(
²
obs
=²
emit
)
2
1
v
c
=
(
²
obs
=²
emit
)
2
1
(
²
obs
=²
emit
)
2
+ 1
=
1
:
308
1
1
:
308 + 1
v
=
:
308
2
:
308
c
= +4
:
0
±
10
7
m=
sec (
C
)
4. From Snell±s Law,
n
1
sin
1
=
n
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 Summer '05
 wurthmeir
 Physics

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