(b) For
m
= 1 the above equation gives
θ
= 14.4°. The crystal should be turned
45
14.4
30.6
φ
=°
− °
= °
clockwise.
(c) For
m
= 3 the above equation gives
= 48.1°. The crystal should be turned
48.1
45
3.1
−
°
=
°
counterclockwise.
(d) For
m
= 4 the above equation gives
= 82.8°. The crystal should be turned
82.8
45
37.8
−
°
counterclockwise.
Note that there are no intensity maxima for
m
> 4 as one can verify by noting that
m
λ
/2
d
is greater than 1 for
m
greater than 4.
73. We want the reflections to obey the Bragg condition 2
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This note was uploaded on 06/03/2011 for the course PHY 2049 taught by Professor Any during the Spring '08 term at University of Florida.
 Spring '08
 Any
 Physics

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