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Chapter 27: Q31CQ (page 995)
Can a sound wave in air be polarized? Explain
No, polarization of sound waves is not possible.
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A telescope can be used to enlarge the diameter of a laser beam and limit difddfraction spreading. The laser beam is sent through the telescope in opposite the normal direction and can then be projected onto a satellite or the Moon.
(a) If this is done with the Mount Wilson telescope, producing a \(2.54 - m\) diameter beam of \(633 - nm\) light, what is the minimum angular spread of the beam?
(b) Neglecting atmospheric effects, what is the size of the spot this beam would make on the Moon, assuming a lunar distance of \(3.84 \times {10^8}{\rm{ }}m\)?
What are the advantages of a diffraction grating over a prism in dispersing light for spectral analysis?
Suppose a feather appears green but has no green pigment. Explain in terms of diffraction.
(a) Find the angle between the first minima for the two sodium vapor lines, which have wavelengths of 589.1 and 589.6 nm when they fall upon a single slit of width 2.00 碌m. (b) What is the distance between these minima if the diffraction pattern falls on a screen 1.00 m from the slit? (c) Discuss the ease or difficulty of measuring such a distance.
Suppose pure-wavelength light falls on a diffraction grating. What happens to the interference pattern if the same light falls on a grating that has more lines per centimeter? What happens to the interference pattern if a longer-wavelength light falls on the same grating? Explain how these two effects are consistent in terms of the relationship of wavelength to the distance between slits.
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