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COMEDK20269 May 2026Evening ShiftPhysicsDual Nature of MatterActual

When metal of work function 1.4eV is exposed to a radiation, the maximum kinetic energy of the electron emitted is 0.4eV. The stopping potential required is:

Options

  1. A0.2 V
  2. B1.4 V
  3. C0.4 V
  4. D2.8 V

Correct answer

C. 0.4 V

Step-by-step solution

Given maximum kinetic energy of the emitted electron, K_ = 0.4 eV. The relation between maximum kinetic energy and stopping potential V₀ is given by K_ = e V₀ . Substituting the value of K_ , we get e V₀ = 0.4 eV. V₀ = 0.4 V. Answer: 0.4 V

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