Question

Calculate the distance d between two successive planes when the first-order diffraction of X-rays of wavelength 1.54 Å is reflected at an angle of 11.29°. [Given: sin 11.29° = 0.1958]

विकल्प

• 3.93 Å

• 3.13 Å

• 2.57 Å

• 2.07 Å

Answer 1

3.93 Å

Explanation:

n = 1, λ = 1.54 Å, θ = 11.29°

According to the Bragg's equation,

nλ = 2d sin θ

d = `("n"lambda)/(2"sin"theta) = (1 xx 1.54)/(2 xx sin11.29^circ) = 1.54/(2 xx 0.1958) = 3.93`Å