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Chapter 29: Q15CQ (page 1061)
Your pupils dilate when visible light intensity is reduced. Does wearing sunglasses that lack UV blockers increase or decrease the UV hazard to your eyes? Explain.
It will decrease the effect of UV on your eyes.
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How can treating food with ionizing radiation help keep it from spoiling? UV is not very penetrating. What else could be used?
An electron microscope produces electrons with a \(2.00 - {\rm{pm}}\) wavelength. If these are passed through a \({\rm{1}}{\rm{.00 - nm}}\) single slit, at what angle will the first diffraction minimum be found?
(a) How far away must you be from a \({\bf{650 - kHz}}\) radio station with power \({\bf{50}}{\bf{.0 kW}}\) for there to be only one photon per second per square meter? Assume no reflections or absorption, as if you were in deep outer space.
(b) Discuss the implications for detecting intelligent life in other solar systems by detecting their radio broadcasts.
(a) Calculate the momentum of a photon having a wavelength of \({\bf{2}}{\bf{.50}}\;{\bf{\mu m}}\).
(b) Find the velocity of an electron having the same momentum.
(c) What is the kinetic energy of the electron, and how does it compare with that of the photon?
Question: (a) Calculate the energy in \({\text{eV}}\) of an \({\text{IR}}\) photon of frequency \({\text{2}}{\text{.00 \times 1}}{{\text{0}}^{{\text{13}}}}{\text{ Hz}}\).
(b) How many of these photons would need to be absorbed simultaneously by a tightly bound molecule to break it apart?
(c) What is the energy in \({\text{eV}}\) of a \(\gamma \) ray of frequency \({\text{3}}{\text{.00 \times 1}}{{\text{0}}^{{\text{20}}}}{\text{ Hz}}\)?
(d) How many tightly bound molecules could a single such \(\gamma \) ray break apart?
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