In the photoelectric effect,the photocurrent:

$A$ photosensitive material is at $9\,m$ to the left of the origin and the source of light is at $7\,m$ to the right of the origin along the $x$-axis. The photosensitive material and the source of light start from rest and move,respectively,with $8\widehat{i}\,m/s$ and $4\widehat{i}\,m/s$. The ratio of intensities at $t = 0$ to $t = 3\,s$ as received by the photosensitive material is:

The figure shows a plot of photo current versus anode potential for a photo sensitive surface for three different radiations. Which one of the following is a correct statement?

Threshold frequency of which of the following metals does not lie in the ultraviolet region (in the case of the photoelectric effect)?

How many times more photons are emitted from a photocell by a source placed at a distance of $1 \ m$ compared to a source placed at a distance of $2 \ m$?

Which of the following statements is correct in photoelectric emission?