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The kinetic energy of an electron ejected from a metal is 3.2?10?19 J. If the work function is 1.6?10?19 J, what is the energy of the incident photon?
4.8?10?19 J
1.6?10?19 J
3.2?10?19 J
0.8?10?19 J
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If a light source emits 1.0?1019 photons per second, and each photon has energy 3.0?10?19 J, what is the power of the source?
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What is the de Broglie wavelength of an electron moving at 1.0?106 m/s? (mass of electron me?=9.11?10?31 kg)
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