Bose-Einstein statistics is applicable to particles with

Consider two black bodies $A$ and $B$ having equal surface areas. On the surface of $A$,$n$ photons of frequency $f$ are incident perpendicularly in a time $t$. On the surface of $B$,$2n$ photons of frequency $3f$ are incident perpendicularly in a time $4t$. The ratio of average intensity of radiation on surface $A$ to that on surface $B$ is

What will be the velocity of a particle when its mass becomes twice its rest mass?

Monochromatic light of frequency $6.0 \times 10^{14} \text{ Hz}$ is produced by a laser. The power emitted is $2 \times 10^{-3} \text{ W}$. The number of photons emitted,on the average,by the source per second is

The energy of a photon whose frequency is $10^{12} \text{ MHz}$ is:

The wavelength of a $1 \;keV$ photon is $1.24 \times 10^{-9} \;m$. What is the frequency of a $1 \;MeV$ photon?