The maximum distance between interatomic lattice planes is $15 ˚ A$ . The maximum wavelength of X-rays which are diffracted by this crystal will be

15 ˚ A

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20 ˚ A

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30 ˚ A

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45 ˚ A

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Solution

The correct option is D $30 ˚ A$
$λ_{m a x} = \frac{2 d s i n Θ}{n_{m i n .}}$

$= \frac{2 \times 15 \times s i n 90^{o}}{1}$

$= 30 ˚ A$

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