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Question

The stopping potential left parenthesis V subscript 0 end subscript right parenthesis versus frequency (n) plot of a substance is shown in figure the threshold wave length is

  1. 5 cross times 1 0 to the power of 14 end exponent m    
  2. 6000Å    
  3. 5000 Å    
  4. Can not be estimated from given data    

The correct answer is: 6000Å


    lambda subscript 0 end subscript equals fraction numerator c over denominator nu subscript 0 end subscript end fraction equals fraction numerator 3 cross times 1 0 to the power of 8 end exponent over denominator 5 cross times 1 0 to the power of 14 end exponent end fraction equals 6 cross times 1 0 to the power of negative 7 end exponent m equals 6000 Å

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