KVPY SB SX Exam 2011 Question Paper

Question : 53 of 120

Marks: +1, -0

To obtain a diffraction peak, for a crystalline solid with interplane distance equal to the wavelength of incident X-ray radiation, the angle of incidence should be

90°
0°
30°
60°

Validate

Solution:

From Bragg's equation
nλ = 2d sinθ
d = λ, n = 1
1 × λ = 2 × λ sinθ
sin θ

=1/2

θ = 30°

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