What will be the wavelength of the \( X \) - rays which give a diffraction angle \( 2 \theta \) ...

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What will be the wavelength of the \( X \) - rays which give a diffraction angle \( 2 \theta \) equal to \( 16.80^{\circ} \) for a crystal, if the inter planar distance in the crystal is \( 0.200 \mathrm{~nm} \) and only first order diffraction is observed \( \left(\sin 8.40^{\circ}=0.146\right) \)
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