List of top Physics Questions on Atomic Structure asked in AP ECET Metallurgical Eng, AP ECET ECE

If the maximum kinetic energy of emitted photo electrons from a metal is 0.9 eV and work function is 2.2 eV then the energy and wavelength of incident radiation are

Two photons of energy $2.5 \text{ eV}$ and $3.5 \text{ eV}$ fall on a metal surface of work function $1.5 \text{ eV}$. The ratio of the maximum velocities of the photoelectrons emitted from the metal surface is