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The wavelength of x-ray which give a diffraction angle $(2θ)$ equal to 16.8^o for a crystal with interplanar distance equal to 0.2nm [Assume first order diffraction, $sin8 {.4}^{o} =0 .14$ ]

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56 nm

5.6 nm

0.056 nm

0.56 nm

answer is A.

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Detailed Solution

$λ = 2 d S i n θ λ = 2 \times 0.200 \times 10^{- 9} m \times S i n (8 . 40^{\circ}) λ = 0.056 n m$

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