According to the modern theory of the nature of light,light has ...

When an $X$-ray photon collides with a proton,its frequency:

The principle of $LASER$ action involves:

Two sources of light emit with a power of $200 \ W$. The ratio of the number of photons of visible light emitted per second by each source having wavelengths $300 \ nm$ and $500 \ nm$ respectively,will be:

In an accelerator experiment on high-energy collisions of electrons with positrons,a certain event is interpreted as annihilation of an electron-positron pair of total energy $10.2 \; BeV$ into two $\gamma$-rays of equal energy. What is the wavelength associated with each $\gamma$-ray? $(1 \; BeV = 10^9 \; eV)$

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