Suppose that at least 14.7 eV is needed to free an electron from a particular element, i.e., to ionize the atom. What is the lowest frequency photon which can accomplish this? And, what is the corresponding wavelength for that photon?

Answer 1

h f = 14.7 eV

lambda = c T = c/f

c about 3*10^8 m/s

Answer 2

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