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MHT CET Medical202622 April 2026Morning ShiftPhysicsDual Nature of MatterActual

A photon of energy 8 eV is incident on a metal surface of work function 3.75 eV. The stopping potential of the metal is

Options

  1. A3.25 V
  2. B3.5 V
  3. C4.15 V
  4. D4.25 V

Correct answer

D. 4.25 V

Step-by-step solution

According to Einstein's photoelectric equation, the maximum kinetic energy of the emitted photoelectrons is given by: K_ = E - where E is the energy of the incident photon and is the work function of the metal. Substituting the given values: K_ = 8 eV - 3.75 eV = 4.25 eV The stopping potential V₀ is related to the maximum kinetic energy by K_ = e V₀ . Therefore, e V₀ = 4.25 eV V₀ = 4.25 V Answer: 4.25 V

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