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When a crystal surface is exposed to X-r...

When a crystal surface is exposed to X-rays of 250 pm wave length, the first order reflection occurs at `30^(@)`. The interplanar distance of the planes producing this reflection is

A

125 pm

B

250 pm

C

373 pm

D

500 pm

Text Solution

Verified by Experts

The correct Answer is:
B
From Bragg.s law, we have `d=(nlamda)/(2sintheta)=((1)(250" pm"))/((2)(sin30^(@)))=250` pm
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