Question

The electron in the hydrogen atom jumps from excited state $(n=3)$ to its ground state $(n=1)$ and the photons thus emitted irradiate a photosensitive material. If the work function of the material is 5.1 eV, the stopping potential is estimated to be:

[Given: The energy of the electron in $n^{th}$ state $E_n=-\frac{13.6}{n^2}eV$]

• A. 12.1 V
• B. 17.2 V
• C. 7 V
• D. 5.1 V

Answer 1

The correct option is C 7 V