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Chapter 5: Q5DQ (page 1104)
When hot air rises from a radiator or heating duct, objects behind it appear to shimmer or waver. What causes this?
Due to the refraction of the light, objects behind the radiator appear to shimmer or waver.
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Two small stereo speakers A and B that are 1.40 m apart are sending out sound of wavelength 34 cm in all directions and all in phase. A person at point P starts out equidistant from both speakers and walks so that he is always 1.50 m from speaker B (Fig. E35.1). For what values of x will the sound this person hears be (a) maximally reinforced, (b) cancelled? Limit your solution to the cases where x 1.50 m.
Sunlight or starlight passing through the earth鈥檚 atmosphere is always ben toward the vertical. Why? Does this mean that a star is not really where it appears to be? Explain.
Figure 31.12 (Section 31.2) shows a loudspeaker system. Low-frequency sounds are produced by the woofer, which is a speaker with a large diameter; the tweeter, a speaker with a smaller diameter, produces high-frequency sounds. Use diffraction ideas to explain why the tweeter is more effective for distributing high-frequency sounds uniformly over a room than is the woofer.
A student claims that she can start a fire on a sunny day using just the sun鈥檚 rays and a concave mirror. How is this done? Is the concept of image relevant? Can she do the same thing with a convex mirror? Explain.
A ray of light in air strikes a glass surface. Is there a range of angles for which total internal reflection occurs? Explain.
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