Ultraviolet light of wavelength $300 \ nm$ and intensity $1.0 \ watt/m^2$ falls on the surface of a photosensitive material. If $1\%$ of the incident photons produce photoelectrons, then the number of photoelectrons emitted from an area of $1.0\ cm^2$ of the surface is nearly
$9.61 \times {10^{14}}per\;\sec $
$4.12 \times {10^{13}}per\;\sec $
$1.51 \times {10^{12}}per\;\sec $
$2.13 \times {10^{11}}per\;\sec $
Dual nature of radiation is shown by
The ratio of the energy of a photon with $\lambda = 150\,nm$ to that with $\lambda = 300\,nm$ is
A photon in motion has a mass
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 :