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Unformatted text preview: Questions W denotes answer available in Student SolutionsManual/Study Guide; O denotes objective question 1. Why can you hear around corners, but not see around corners? 2. Holding your hand at arms length, you can readily block sunlight from reaching your eyes. Why can you not block sound from reaching your ears this way? 3. O Consider a wave passing through a single slit. What happens to the width of the central maximum of its diffraction pattern as the slit is made half as wide? (a) The central maximum becomes one-fourth as wide. (b) It becomes one-half as wide. (c) Its width does not change. (d) It becomes two times wider. (e) It becomes four times wider. 4. O Assume Figure 38.1 was photographed with red light of a single wavelength . The light passed through a single slit of width a and traveled distance L to the screen where the photograph was made. Consider the width of the central bright fringe, measured between the dark fringes on both sides of it. Rank from largest to smallest the widths of the central fringe in the following situations and note any cases of equality. (a) The experiment is performed as photographed. (b) The experiment is performed with light whose frequency is increased by 50%. (c) The experiment is performed with light whose wavelength is increased by 50%. (Its wavelength is 3 /2.) (d) The experiment is performed with the original light and with a slit of width 2 a . (e) The experiment is performed with the original light and slit, and with distance 2 L to the screen. (f) The experiment is performed with light of twice the original intensity. 5. O In Active Figure 38.4, assume the slit is in a barrier that is opaque to x-rays as well as to visible light. The photograph in Active Figure 38.4b shows the diffraction pattern produced with visible light. What will happen if the experiment is repeated with x- rays as the incoming wave and with no other changes? (a) The diffraction pattern is similar. (b) There is no noticeable diffraction pattern but rather a projected shadow of high intensity on the screen, having the same width as the slit. (c) The central maximum is much wider and the minima occur at larger angles than with visible light. (d) No x-rays reach the screen. 6. O Off in the distance, you see the headlights of a car, but they are indistinguishable from the single headlight of a motorcycle. Assume the cars headlights are now switched from low beam to high beam so that the light intensity you receive becomes three times greater. What then happens to your ability to resolve the two light sources? (a) It increases by a factor of 9. (b) It increases by a factor of 3. (c) It remains the same. (d) It becomes one-third as good. (e) It becomes one-ninth as good....
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