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Question

Bragg gave a mathematical equation:

nλ = 2d sinθ

Here which of the following is correct?


A

λ wavelength of incident x-ray

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B

d distance between the layers

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C

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D

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Solution

The correct option is 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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