If a photon of energy $7.08\times {10}^{-19}J$ falls on lithium metal having work function $2.42eV$ then the kinetic energy of the ejected election will be:

Q. Calculate the energy of photons having wavelength, $5\times {10}^{-7}m$ falls on a metal surface of work function, $3.4\times {10}^{-19}J$:

Q. In a photoelectric effect, the energy of the photon striking a metallic surface is $5.6\times {10}^{-19}J$. The kinetic energy of the ejected electrons is $12.0\times {10}^{-20}J$. The work function is:

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

Q. When photons of energy h fall on an aluminium plate (of work function E${}_0$), photoelectrons of maximum kinetic energy K are ejected. If the frequency of the radiation is doubled, then the maximum kinetic energy of the ejected photoelectrons will be: