PhysicsMediumHigh School (11–12)Modern Physics › Dual Nature of Radiation and MatterBoard ExamAPA-LevelIB
Created by StemPy LabTwo metals, X and Y, are used as photocell cathodes. The longest wavelength that frees electrons from X is greater than the one for Y. Which metal needs more energy to release an electron?
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← 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.A red laser gives out light of wavelength 760 nm at a rate of 2.4 mW. About how many photons leave it each second? Use hc = 1240 eV nm and e = 1.6 × 10⁻¹⁹ C. →
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