Which of the following is correct regarding X-rays
(i) X-rays are electromagnetic radiation (photon) of short wavelength. X-rays move in straight lines in vacuum at a speed equal to that of light
(ii) Since X-rays are charge-less particles and therefore not deflected by electric or magnetic fields
(iii) X-rays are diffracted by crystals in accordance with Bragg's law. The Bragg's law states `2 d sin theta=n lambda`, where n is integer. `theta` is the angle at which X-ray is incident on the plane of atoms, d: distance between the parallel planes of atom
(iv) X-rays affect a photographic plate more strongly than visible light

Options

A. (i), (ii),(iii)
B. (ii),(iii),(iv)
C. (i),(ii),(iv)
D. all

Answer

D