The graph between the intensity of light $(I)$ falling on a metallic plate and the generated photoelectric current $(i)$ is:

$A$ photocell is illuminated by a small bright source placed $d \; m$ away. When the same source of light is placed $\frac{d}{2} \; m$ away,the number of electrons emitted by the photocathode would

The correct curve between the stopping potential $(V_0)$ and intensity of incident light $(I)$ is

In the photoelectric effect,electrons are emitted from a metal surface only when the incident light has a certain minimum . . . . . . .

Assertion : Kinetic energy of photoelectrons emitted by a photosensitive surface depends upon the intensity of incident photon.
Reason : The ejection of electrons from a metallic surface is possible with a frequency of incident photon below the threshold frequency.

What is the phenomenon of the photoelectric effect?