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The surface of a metal is illuminated alternatively with photons of energies E=4eV and E=2.5eV resp. The ratio of maximum speeds of the photoelectrons emitted is the two cases is 2. The work function of the metal in eV is ......
Option: 1 2.5
Option: 2 5
Option: 3 7.5
Option: 4 10
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Correct Answer: 1