In a photoelectric cell,the conversion of energy takes place from:

After a photon is incident on a metal surface,the time taken for the emission of a photoelectron from the surface is approximately ...........

When the distance of a light source from a photocell is $r_1$,the photoelectric current is $I_1$. If the distance is $r_2$,the photoelectric current becomes $I_2$. The ratio $(I_1 : I_2)$ is .....

Which of the following statements is true for photoelectrons emitted from a sodium metal surface?

$A$ photoelectric cell is illuminated by a point source of light $1 \ m$ away. When the source is shifted to $2 \ m$,then:

The number of photoelectrons emitted for light of a frequency $\nu$ (higher than the threshold frequency $\nu_0$) is proportional to