In the photoelectric effect, electrons are ejected from a metal surface when light strikes it. A certain minimum energy, Emin, is required to eject an electron. Any energy absorbed beyond that minimum gives kinetic energy to the electron. It is found that when light at a wavelength of 540 nm falls on a cesium surface, an electron is ejected with a kinetic energy of 2.60 × 10–20 J. When the wavelength is 400 nm, the kinetic energy is 1.54 × 10–19 J.
(a) Calculate Emin for cesium in joules.
(b) Calculate the longest wavelength, in nanometers, that will eject electrons from cesium.
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