PhysicsMediumHigh School (11–12)Modern Physics › Dual Nature of Radiation and MatterBoard ExamAPA-LevelIB
Created by StemPy LabWhat is meant by the threshold frequency of a metal?
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← A photocell cathode needs 5.1 eV to release an electron. Ultraviolet light of wavelength 190 nm is shone on it. What collector voltage, in size, stops the current? Use hc = 1240 eV nm.On a graph of stopping potential against frequency, the straight line for a metal cuts the frequency axis at 6.8 × 10¹⁴ Hz. What is the work function of the metal? Use h = 4.14 × 10⁻¹⁵ eV s. →
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