p37 053

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53. Bragg’s law gives the condition for a diffraction maximum:

2d sin θ =

where d is the spacing of the crystal planes and λ is the wavelength. The angle θ is measured from the
surfaces of the planes. For a second-order reflection m = 2, so

d =

2 sin θ

=

2(0.12

× 10

9

m)

2 sin 28

= 2.56

× 10

10

m = 256 pm .


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