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Question

In Millikan’s experiment, the slope of v versus Vo graph was found to be 4.125×1015Vs. Given e=1.6×1019C, the value of Planck’s constant is
  1. 6.2×1034Js
  2. 6.4×1034Js
  3. 4.125×1034Js
  4. 6.6×1034Js

A
6.4×1034Js
B
4.125×1034Js
C
6.6×1034Js
D
6.2×1034Js
Solution
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Using Vo=heϕ
Slope of the graph is equal to he
Slope of the graph =4.125×1015Vs
Given : e=1.6×1019C
Value of Planck's constant h=e×slope
h=1.6×1019×4.125×1015=6.6×1034Js

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