a photoelectric experiment
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1. Photoelectric effect. In a photoelectric experiment in which monochromatic light of wave-
length \ falls on a potassium surface, it is found that the stopping potential Vstop is 1.9 V
for >
300 nm and 0.88 V for \ = 400 nm. Imagine we know neither Planck's constant,
nor the workfunction for potassium, nor the threshold frequency fo. But assume we do know
the elementary charge e 1.60 × 10-19 C and want to test the theoretical prediction of
Eintsein's theory.
=
(a) From the given data, calculate a value for Planck's constant, h.
(b) From the same data, find the workfunction Eo and the threshold frequency fo for potas-
sium.
(c) Then compare your results for h and Eo to their known values (see Knight, Table 38.1
for the work function).
(d) Plot eVstop as a linear function of frequency f. Include the information you have found
in parts (a) and (b) as well as the experimental data.
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