The longest wavelength X-ray that can undergo Bragg diffraction in a crystal for a given family of planes of spacing d is
B. d/2
C. d
D. 2d
E. 4d
(GR9277 #02)
Solution:
Bragg’s law: 2d sin θ = nλ
Maximum → sin θ = 1
and n = 1 (1st order)
λ = 2d
Answer: D
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