The charge on gamma rays is

$A$ photon-sensitive metal is not emitting photoelectrons when irradiated. It will do so when the threshold is crossed. To cross the threshold,we need to increase:

The following sketch represents a specific wave of light. What will be the color of the light represented by this wave?

Which of the following does not characterise $X$-rays?

With regard to the photoelectric effect,identify the correct statement among the following.

An atom emits energy equal to $4 \times 10^{-12} \, erg$. To which part of the electromagnetic spectrum does it belong?