Created by StemPy LabA photocell cathode has a work function of eV. It is lit by ultraviolet light of wavelength nm. How much kinetic energy does the fastest photoelectron have? Use eV nm.
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← Which change leaves the stopping potential of a photocell unchanged?The threshold frequency of a cathode is 5.2 × 10¹⁴ Hz. A lamp of frequency 9.1 × 10¹⁴ Hz is switched on, and the collector is made negative until the current just stops. How large is the collector voltage? Use h/e = 4.14 × 10⁻¹⁵ V s. →
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