JEE Main · 2021 · 16 Mar 2021 · Shift 1 · Modern Physics

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The stopping potential in the context of photoelectric depends on the following property of incident electromagnetic radiation:

(A)Frequency✓ Correct
(B)Amplitude
(C)Intensity
(D)Phase

Answer: (A)

Solution

Einstein's photoelectric relation fixes the stopping potential by

e V_{0} = h ν - ϕ

. One electron absorbs one photon, so the largest kinetic energy a photoelectron can carry is set by the energy

h ν

of a single photon less the work function of the metal. Raising the amplitude or the intensity only sends more photons per second and so raises the photocurrent, leaving the energy of each photon untouched, and the phase of the wave carries no energy information at all.
The stopping potential depends on the frequency of the incident radiation.

JEE Main · 2021 · 16 Mar 2021 · Shift 1 · Single correct option

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