The condition for observing diffraction from the nickel surface is · ABC26PH0522

Subject: Physical Chemistry · Chapter: Solid State Chemistry · Topic: Solid State – General · Exam: GATE 2005-2021 · Marks: 2 · Difficulty: Easy

The condition for observing diffraction from the nickel surface is

(a)$\lambda \gg 2\mathrm{d}$

(b)$\lambda \leq 2\mathrm{d}$

(c)$\lambda \leq \mathrm{ad}$

(d)$\lambda \geq \mathrm{ad}$

Answer

Answer: B ✓ checked by 4AB · confidence high

The source book printed no answer; this one was worked out and checked — see the explanation.

Explanation

Bragg: nλ = 2d sin θ needs sin θ ≤ 1, so diffraction requires λ ≤ 2d (b).

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