The time taken by a photoelectron to come out after the photon strikes is approximately

For alkali metals, threshold frequencies lie in which region?

Which figure shows the correct variation of applied potential difference $(V)$ with photoelectric current $(I)$ at two different intensities of light $(I_1 < I_2)$ of the same wavelength?

During a photoelectric effect experiment,which of the following physical quantities depends on the intensity of the incident radiation?

The number of photo-electrons emitted per second from a metal surface increases when:

When monochromatic radiation of intensity $I$ falls on a metal surface, the number of photoelectrons and their maximum kinetic energy are $N$ and $K$ respectively. If the intensity of radiation is $2I$, the number of emitted electrons and their maximum kinetic energy are respectively