X-rays strike a crystal of atomic spacing 2 × 10⁻¹⁰ m at a glancing angle of 30°. What wavelength gives first-order diffraction?
Correct answer C. 2 × 10⁻¹⁰ m
Explanation
Bragg's law gives nλ = 2d sin θ, so λ = 2 × (2 × 10⁻¹⁰ m) × sin 30° = 2 × 10⁻¹⁰ m for n = 1.
Answer checked How we write and check questions
Discussion