Physics-
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Question

Electrons ejected from the surface of a metal, when light of certain frequency is incident on it, are stopped fully by a retarding potential of 3 volts Photo electric effect in this metallic surface begins at a frequency 6 x 1014s -1 The frequency of the incident light in s-1 is [h=6 x 10-34J-sec;charge on the electron=1.6x10-19C]

  1. 7.5 x 1013    
  2. 13.5 x 1013    
  3. 14 x 1014    
  4. 7.5 x 1015    

The correct answer is: 14 x 1014

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