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JEE Main · 2025 · 29 Jan 2025 · Shift 2 · Modern Physics

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In an experiment with photoelectric effect, the stopping potential.
  1. (A)increases with increase in the wavelength of the incident light
  2. (B)increases with increase in the intensity of the incident light
  3. (C)is times the maximum kinetic energy of the emitted photoelectrons✓ Correct
  4. (D)decreases with increase in the intensity of the incident light

Answer: (C)

Solution

Einstein's photoelectric equation gives the energy balance for an emitted electron:


The stopping potential is the potential that just brings the fastest photoelectrons to rest, so


This shows the stopping potential is times the maximum kinetic energy of the photoelectrons. Since depends only on the frequency of the incident light (through ), the stopping potential changes with wavelength, not with the intensity of the light — intensity only changes how many photoelectrons are emitted, not their maximum energy.

JEE Main · 2025 · 29 Jan 2025 · Shift 2 · Single correct option

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