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General
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Question

The stopping potential V for photoelectric emission from a metal surface is plotted along Y-axis and frequency n of incident light along X-axis. A straight line is obtained as shown. Planck's constant is given by

  1. Slope of the line    
  2. Product of slope on the line and charge on the electron    
  3. Product of intercept along Y-axis and mass of the electron    
  4. Product of Slope and mass of electron    

The correct answer is: Product of slope on the line and charge on the electron


    K 0 subscript m a x end subscript Þ e V subscript 0 end subscript equals h nu minus h nu subscript 0 end subscriptÞ V subscript 0 end subscript equals fraction numerator h over denominator e end fraction nu minus fraction numerator h nu subscript 0 end subscript over denominator e end fraction
    Comparing this equation with y equals m x plus c, we get slope m equals fraction numerator h over denominator e end fraction Þ h equals m cross times e.

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