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The largest distance between the interat...

The largest distance between the interatomic planes of crystal is `10^(-7) cm`. The upper limit for the wavelength of `X` - rays which can be usefully studied with this crystal is

A

`1 Å`

B

`5 Å`

C

`10 Å`

D

`20 Å`

Text Solution

Verified by Experts

The correct Answer is:
D
`2d sin theta=n lambda`
For `lambda` to be maximum, `theta=90^(@) , n=1`
`lambda=2d=2xx10=20 Å`
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