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NEET2004PhysicsDual Nature of MatterActual

A photon of energy 4 eV is incident on a metal surface whose work function is 2 eV . The minimum reverse potential to be applied for stopping the emission of electrons is

Options

  1. A2 ~V
  2. B4 ~V
  3. C6 ~V
  4. D8 ~V .

Correct answer

A. 2 ~V

Step-by-step solution

When stopping potential is applied no electron will reach the cathode and the current will becomes zero. e V₀= 1 2 m v_ ^2 Also, 1 2 m v_ ^2=h v- work function gathered =4 eV -2 eV =2 eV e V₀=2 eV stopping potential =2 ~V gathered

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