Calculate `lambda` of X-rays which give a diffraction angle `2 theta = 16.8^(@)` for crystal, if the interplanar distance in the crystal is `0.2 nm` and that only for the first-order diffraction is observed. Given `sin 8.40^(@) = 0.146`.
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The correct Answer is:
`5.84xx10^(-11)m;`
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