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Unformatted text preview: photon that this excited electron can emit? c) What is the energy of the lowest frequency photon that this excited electron can emit? 4. (2 pts) Why can intense red light not cause electrons to be emitted from a metal surface but weak ultraviolet light can? 5. (2 pts) An isotope of Astatine ( 218 85 At ) decays first by alpha decay, then beta decay. What is the final isotope? (Some possibly important information about the atomic numbers of some elements: 81 Tl , 82 Pb , 83 Bi , 84 Po , 85 At , 86 Rn , 87 Fr , 88 Ra.) E 4 = 12.0 eV E 3 = 10.0 eV E 2 = 6.0 eV E 1 = 1.0 eV electron (ground state)...
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- Spring '09