Question

In a photoelectric effect experiment, a photon of energy $13eV$ is incident on a metal of work function$=0.9eV$ due to which a photoelectron is emitted from metal. Energy of this photoelectron is sufficient to excite a $H-$ atom from its ground state then

• A. Kinetic energy of emitted photo electron may be $12.1ev$
• B. Kinetic energy of emitted photo electron may be $10.2ev$
• C. In subsequent emission spectrum of H-atom either 1 or 2 or 3 spectral lines will be present.
• D. Maximum possible stopping potentials is $12.1ev$

Answer 1

Answer: (A), (B), (C), (D)

The correct options are
A Kinetic energy of emitted photo electron may be $12.1ev$
B Kinetic energy of emitted photo electron may be $10.2ev$
C In subsequent emission spectrum of H-atom either 1 or 2 or 3 spectral lines will be present.
D Maximum possible stopping potentials is $12.1ev$

Maximum KE of the emitted electron is $=13-0.9=12.1eV$.
So, $K{E}_{nax}=12\cdot 1ev$
since $KE\le K{E}_{nax}$ so all four options are correct.