Question

In a photoelectric experiment using a sodium surface, you find a stopping potential of for a wavelength of and a stopping potential of for a wavelength of From these data find (a) a value for the Planck constant, (b) the work function for sodium, and (c) the cutoff wavelength for sodium.

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Solution

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(a) For the first and second case (labeled 1 and 2) we have
from which and can be determined. 
Thus,
(b) The work function is
(c) Let to obtain

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