Created by StemPy LabWhy does light of a frequency below the threshold never free electrons, even when it is very intense?
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← A pulse of laser light of wavelength 496 nm carries 4.0 mJ. About how many photons does it hold? Use hc = 1240 eV nm and e = 1.6 × 10⁻¹⁹ C.A beam of 5.0 × 10¹⁵ photons each second falls on a photocell. Of every hundred photons, 4.5 free an electron. What is the photocurrent? Use e = 1.6 × 10⁻¹⁹ C. →
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