When an inert gas is filled in the place vacuum in a photo cell, then
Photo-electric current is decreased
Photo-electric current is increased
Photo-electric current remains the same
Decrease or increase in photo-electric current does not depend upon the gas filled
If the total energy transferred to a surface in time $t$ is $6.48 \times 10^5 \mathrm{~J}$, then the magnitude of the total momentum delivered to this surface for complete absorption will be :
The light of two different frequencies whose photons have energies $3.8 \,eV$ and $1.4 \,eV$ respectively, illuminate a metallic surface whose work function is $0.6 \,eV$ successively. The ratio of maximum speeds of emitted electrons for the two frequencies respectivly will be
What is velocity of photon ?
Do all the electrons that absorb a photon come out as photoelectrons ?