This is an apparatus for studying the photoelectric effect. The work function of the material being investigated is 3.5 *10-19 J. The battery is set at 1.5 V. What is the longest wavelength of light needed to produce an electric current from the cathode C) to the anode A) ?
A) 337 nm
B) 354 nm
C) 620 nm
D) 827 nm
E) None of these is correct.
Correct Answer:
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