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What is the energy of a photon with a wavelength of 1 nm (typical X-ray)?
1.989?10?16 J
1.989?10?17 J
1.989?10?18 J
1.989?10?19 J
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The threshold frequency of a metal is 5.0?1014 Hz. If light with frequency 4.0?1014 Hz is incident, what is the outcome?
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Convert the energy of the 1 nm photon from the previous question to keV.
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