Photo cells convert

Photoelectrons from a metal do not come out with the same energy. The most appropriate explanation is:

$A$ point source of light is used in an experiment on the photoelectric effect. Which of the following curves best represents the variation of photocurrent $(i)$ with distance $(d)$ of the source from the emitter?

The distance between a light source and a photoelectric cell is $d$. If the distance is decreased to $\frac{d}{2}$, then:

When yellow light is incident on a surface,no electrons are emitted,while green light can emit them. If red light is incident on the surface,then:

The curve between current $(i)$ and potential difference $(V)$ for a photo cell will be: