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Question

Bragg gave a mathematical equation:

             nλ = 2d sinθ

Here which of the following is correct?



Correct Answer
A

λ wavelength of incident x-ray

Correct Answer
B

d distance between the layers

Your Answer
C

Correct Answer
D

ɵ →


Solution

The correct options are
A

λ wavelength of incident x-ray


B

d distance between the layers


D

ɵ →


Recall the experiment which you saw in the videos.

We got the formula as,

n λ = 2d sinθ

How we came to this conclusion,

For peaks, we know that we need the following arrangement:

and this will be repeated for integral multiple of λ.

Therefore, n an integer

λ  wavelength of x-ray

Now, look at the crystal diagram.

Here you can see that,

d distance between the layers.

θ  angle between incident x-rays and the plane of crystal.

Therefore, (a), (b) and (d) are correct.

Do not get confused in e, it is not angle between the incident x-ray and the perpendicular of the plane.

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