The energy equivalent to $1\,mg$ of matter in $MeV$ is
$56.25 \times 10^{22}$
$56.25 \times 10^{24}$
$56.25 \times 10^{26}$
$56.25 \times 10^{28}$
What is velocity of photon ?
There are ${n_1}$ photons of frequency ${\gamma _1}$ in a beam of light. In an equally energetic beam, there are ${n_2}$ photons of frequency ${\gamma _2}$. Then the correct relation is
The momentum of a photon of energy $1\,\, MeV$ in $kg \,\,m/s$ will be