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COMEDK2020PhysicsDual Nature of Matter

Light of frequency 10¹⁵ ~Hz falls on a metal surface of work function 2.5 eV . The stopping potential of photoelectrons (in V) is

Options

  1. A1.6
  2. B2.5
  3. C4.1
  4. D6.6

Correct answer

A. 1.6

Step-by-step solution

Frequency of incident light, v=10¹⁵ ~Hz Work function, ₀=25 eV Energy of incident photon, aligned E &=h v &=6.62 10⁻³⁴ 10¹⁵ &=6.62 10⁻¹⁹ ~J &= 6.62 10⁻¹⁹ 1.6 10⁻¹⁹ eV &=4.1 eV aligned According to Einstein's photoelectric equation, array ll & K_ =h v - ₀ & e V₀=h v - ₀ & e V₀=4.1 eV -25 eV & e V₀=1.6 eV & V₀=1.6 ~V array

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