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NEET2012PhysicsDual Nature of MatterActual

Two radiations of photon energies 1 eV and 2.5 eV , successively illuminate a photosensitive metallic surface of work function 0.5 eV . The ratio of the maximum speeds of the emitted electrons is

Options

  1. A1: 4
  2. B1: 2
  3. C1: 1
  4. D1: 5

Correct answer

B. 1: 2

Step-by-step solution

We have 1 2 m v_ ^2=E- Here case (i) gathered 1 2 m v_ 1 ^2=(1-0.5) eV 1 2 m v_ 2 ^2=(2.5-0.5) eV gathered Hence, v_ 1 ^2 v_ 2 ^2 = 1 4 v_ 1 v_ 2 = 1 2

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