What is the charge on a photon?

Two sources of light emit $X$-rays of wavelength $1 \ nm$ and visible light of wavelength $500 \ nm$,respectively. Both sources emit light of the same power $200 \ W$. The ratio of the number of photons emitted per second by the $X$-ray source to the number of photons emitted per second by the visible light source is:

The energy $E$ and momentum $p$ of a moving body of mass $m$ are related by a specific equation. Given that $c$ represents the speed of light,identify the correct equation.

The momentum of a photon of energy $1 \, MeV$ in $kg \, m/s$ will be:

According to the corpuscular theory of light, which of the following is $NOT$ a property of light?

The idea of the quantum nature of light has emerged in an attempt to explain: