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 photo electron is emitted from metal. Energy of this photo electron 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 potential is $12.1$ volt

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 potential is $12.1$ volt

Maximum kinetic energy of the emitted electron$=13-0.9=12.1eV$

So ${K.E}_{max}=12.1eV$

Since $K.E\le {K.E}_{max}$ so all the four options are correct