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• The work function of cesium is 1.9 eV. This is the lowest value work function of any metal, and consequently, cesium is used in photomultiplier tubes, a kind of visible-light detector so sensitive that single photons can be readily detected, (a) What is the maximum wavelength of light that can eject photoelectrons from cesium? (b) If light with λ = 500 nm strikes cesium, what is the maximum kinetic energy of the ejected electrons?
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