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Question

In a photocell circuit the stopping potential, v0 , is a measure of the maximum kinetic energy of the photoelectrons. The following graph shows experimentally measured values of stopping potential versus frequency v of incident light.
The values of Planck's constant and the work function as determined from the graph are (taking the magnitude of electronic charge to be e=1.6×1019C )
631426_571d869f946c4cc3a5363461f38d4c62.png

A
6.4×1034Js,2.0 eV
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B
6.0×1034Js,2.0 eV
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C
6.4×1034Js,3.2 eV
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D
6.0×1034Js,3.2 eV
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Solution

The correct option is D 6.0×1034Js,2.0 eV
Observing the graph and relating it to the Einstein photoelectric equation, we have the graph between stopping potential and frequency as shown in the figure.

The slope of the graph shown is 4(2)(1.60)×1015
Thus, he=61.6×1015h=6×1034Js

Work function is given by the negative value of Y-intercept.

Y-intercept in the figure is 2Vw=2eV


678208_631426_ans_5da110b6fd304d009b35a586763598f5.png

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