Question

In photoelectric emission process from a metal of work function 1.8 eV, the kinetic energy of most energetic electrons is 0.5 eV. The corresponding stopping potential is

• A. 13V
• B. 0.5V
• C. 23V
• D. 1.8V

Hint:

The stopping potential is the potential required to stop the most energetic emitted photoelectrons.

Answer 1

The Correct Option is B

The stopping potential \( V_0 \) is related to the kinetic energy of the emitted electrons. The stopping potential can be calculated using the equation \( eV_0 = KE \), where \( KE = 0.5 \, \text{eV} \), and \( e \) is the electron charge. The stopping potential comes out to be 0.5V.

Step 2: Conclusion.
The correct stopping potential is 0.5V, corresponding to option (b).