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Chapter 5: Q25DQ (page 1104)
Can water waves be reflected and refracted? Give examples. Does Huygens鈥檚 principle apply to water waves? Explain.
Yes, water waves can both reflect and refract.
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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.
34.14 For a convex spherical mirror that has focal length , what is the distance of an object from the mirror鈥檚 vertex if the height of the image is half the height of the object?
Does it make sense to talk about the polarization of a longitudinal wave, such as a sound wave? Why or why not?
34.15 The thin glass shell shown in Fig. E34.15 has a spherical shape with a radius of curvature of 12cm, and both of its surfaces can act as mirrors. A seed high is placed 15.0cmfrom the center of the mirror along the optic axis, as shown in the figure. (a) Calculate the location and height of the image of this seed. (b) Suppose now that the shell is reversed. Find the location and height of the seed鈥檚 image.
Some loudspeaker horns for outdoor concerts (at which the entire audience is seated on the ground) are wider vertically than horizontally. Use diffraction ideas to explain why this is more efficient at spreading the sound uniformly over the audience than either a square speaker horn or a horn that is wider horizontally than vertically. Would this still be the case if the audience were seated at different elevations, as in an amphitheater? Why or why not?
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