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To obtain a diffraction peak, for a crys...

To obtain a diffraction peak, for a crystalline solid with interplane distance equal to the wavelength of incident X-ray radiation, the angle of incidence should be

A

`90^(@)`

B

`0^(@)`

C

`30^(@)`

D

`60^(@)`

Text Solution

Verified by Experts

The correct Answer is:
C
From Bragg’s equation:
`nlambda = 2d sin theta`
`d = lambda, n =1`
`1 xx lambda = 2 xx lambda sin theta`
`sin theta = 1/2`
`theta = 30^(@)`
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