Question

The Maximum kinetic energy of photoelectron ejected from a metal is x when it is irradiated with radiation having a frequency twice the threshold frequency. If the frequency of the incident radiation is doubled, what is the maximum kinetic energy of the photoelectrons would be affected?

Answer 1

Let, threshold energy be $E$,

Initially, incident energy was $2E$.

Now, incident energy is $4E$.

$\therefore \left(K{E}_{man}\right)$ finally $=3E=3x$.

$[\because (K{E}_{man})$ initially $=E=x$ (Given)]

$\therefore$ Man $KE$ becomes triple.