Bragg gave a mathematical equation:
nλ = 2d sinθ
Here which of the following is correct?
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.