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JEE Main 2026 Apr 4 Shift 1, Physics Q7: Introduction and Photoelectric Effect

JEE Main2026Apr 4, Shift 1Physics
Q.

The graph shows variation of stopping potential with the frequency of the incident radiation for three photosensitive metals , and . Which metal will give out electrons with greater kinetic energy, for the same wavelength of incident radiation?

  1. A

  2. B

  3. C

  4. D

    All the metals will give out photo electrons with same kinetic energies.

Solution

From Einstein's photoelectric equation, . For a fixed incident frequency (fixed wavelength), the metal with the smallest work function gives the largest .

From the graph, the -intercept of each line equals the threshold frequency . The threshold frequencies are in the ratio , so has the smallest .

Therefore emits photoelectrons with the greatest kinetic energy.

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