Chapter 38
423
P38.49
Let the first sheet have its axis at angle
θ
to the original plane of polarization, and let each further
sheet have its axis turned by the same angle.
The first sheet passes intensity
I
max
cos
2
.
The second sheet passes
I
max
cos
4
and the
n
th sheet lets through
II
n
max
max
cos
.
2
090
≥
where
=
°
45
n
.
Try different integers to find
cos
.
25
45
5
0885
×
°
F
H
G
I
K
J
=
cos
.
26
45
6
0902
×
°
F
H
G
I
K
J
=
.
(a)
So
n
=
6
(b)
=°
750
.
P38.50
Consider vocal sound moving at 340 m/s and of frequency 3 000 Hz. Its wavelength is
λ
==
=
v
f
340
3000
0113
ms
Hz
m
..
If your mouth, for horizontal dispersion, behaves similarly to a slit 6.00 cm wide, then
am
sin
θλ
=
predicts no diffraction minima. You are a nearly isotropic source of this sound. It spreads out from
you nearly equally in all directions. On the other hand, if you use a megaphone with width 60.0 cm
at its wide end, then
sin
=
predicts the first diffraction minimum at
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This note was uploaded on 12/14/2011 for the course PHY 203 taught by Professor Staff during the Fall '11 term at Indiana State University .
 Fall '11
 Staff
 Physics, Polarization

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