Energy of a photon is $1 \ MeV,$ then its momentum will be $:-$

It is observed that characteristic $X$-ray spectra of elements show regularity. When frequency to the power '$n$' i.e.,$v^{n}$ of $X$-rays emitted is plotted against atomic number '$Z$',the following graph is obtained. The value of '$n$' is

What is the charge on $\gamma$-rays?

Explain the production,characteristics,and uses of $X$-rays.

The energy of one mole of photons of radiation of wavelength $300 \ nm$ is ...... $kJ \ mol^{-1}$. (Given: $h = 6.63 \times 10^{-34} \ J \ s, N_A = 6.02 \times 10^{23} \ mol^{-1}, c = 3 \times 10^8 \ m \ s^{-1}$)

$A$ metal surface emits photoelectrons when the incident radiation possesses a minimum.....