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NEET2018PhysicsDual Nature of MatterActual

If the maximum kinetic energy of emitted photo electrons from a metal surface of work function 2.5 eV , is 1.7 eV . If wavelength of incident radiation is halved, then stopping potential will be

Options

  1. A2.5 ~V
  2. B6.7 ~V
  3. C5 ~V
  4. D1.1 ~V

Correct answer

B. 6.7 ~V

Step-by-step solution

Energy of incident photons, aligned & h v= ₀+K_ =2.5+1.7=4.2 eV & v =c and v^ 2 =c v^ =2 v aligned According to Einstein's photoelectric equation, aligned e V₀ & =h v^ - ₀=h(2 v )- ₀=2 4.2-1.7 & =6.7 eV V₀=6.7 ~V aligned

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