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Chapter 29: Q17CQ (page 1061)
Can a single microwave photon cause cell damage? Explain.
No, it can't cause any damage because it has very low energy.
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The kinetic energy of an electron accelerated in an x-ray tube is 100 keV. Assuming it is nonrelativistic, what is its wavelength?
(a) If the position of a chlorine ion in a membrane is measured to an accuracy of \[{\rm{1}}{\rm{.00 \mu m}}\] , what is its minimum uncertainty in velocity, given its mass is \[{\rm{5}}{\rm{.86 \times 1}}{{\rm{0}}^{{\rm{ - 26}}}}{\rm{ kg}}\] ?
(b) If the ion has this velocity, what is its kinetic energy in eV, and how does this compare with typical molecular binding energies?
(a) Calculate the number of photoelectrons per second ejected from a \(1.00\,{\rm{m}}{{\rm{m}}^{\rm{2}}}\) area of sodium metal by \(500\,{\rm{nm EM}}\) radiation having an intensity of \(1.30\,{\rm{kW/}}{{\rm{m}}^{\rm{2}}}\) (the intensity of sunlight above the Earth鈥檚 atmosphere). (b) Given that the binding energy is\(2.28\,{\rm{eV}}\), what power is carried away by the electrons? (c) The electrons carry away less power than brought in by the photons. Where does the other power go? How can it be recovered?
Confirm the statement in the text that the range of photon energies for visible light is \({\rm{1}}{\rm{.63}}\) to \({\rm{3}}{\rm{.26 eV}}\), given that the range of visible wavelengths is \({\rm{380}}\) to \({\rm{760 nm}}\).
A laser with a power output of \({\rm{2}}{\rm{.00 mW}}\)at a wavelength of \({\rm{400 nm}}\) is projected onto calcium metal. (a) How many electrons per second are ejected? (b) What power is carried away by the electrons, given that the binding energy is \({\rm{2}}{\rm{.71 eV}}\)?
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