Physics for Scientists and Engineers 8ed - ch35 - end of chapter questions

Physics for Scientists and Engineers 8ed - ch35 - end of chapter questions

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Unformatted text preview: Questions W denotes answer available in Student SolutionsManual/Study Guide; O denotes objective question 1. Why do astronomers looking at distant galaxies talk about looking backward in time? 2. O What is the order of magnitude of the time interval required for light to travel 10 km as in Galileos attempt to measure the speed of light? (a) several seconds (b) several milliseconds (c) several microseconds (d) several nanoseconds 3. O In each of the following situations, a wave passes through an opening in an absorbing wall. Rank the situations in order from the one in which the wave is best described by the ray approximation to the one in which the wave coming through the opening spreads out most nearly equally in all directions in the hemisphere beyond the wall. (a) The sound of a low whistle at 1 kHz passes through a doorway 1 m wide. (b) Red light passes through the pupil of your eye. (c) Blue light passes through the pupil of your eye. (d) The wave broadcast by an AM radio station passes through a doorway 1 m wide. (e) An x-ray passes through the space between bones in your elbow joint. 4. The display windows of some department stores are slanted slightly inward at the bottom. This tilt is to decrease the glare from streetlights and the Sun, which would make it difficult for shoppers to see the display inside. Sketch a light ray reflecting from such a window to show how this design works. 5. You take a child for walks around the neighborhood. She loves to listen to echoes from houses when she shouts or when you clap loudly. A house with a large, flat front wall can produce an echo if you stand straight in front of it and reasonably far away. Draw a birds-eye view of the situation to explain the production of the echo. Shade the area where you can stand to hear the echo. What If? The child helps you discover that a house with an L-shaped floor plan can produce echoes if you are standing in a wider range of locations. You can be standing at any reasonably distant location from which you can see the inside corner. Explain the echo in this case and draw another diagram for comparison. What If? What if the two wings of the house are not perpendicular? Will you and the child, standing close together, hear echoes? What If? What if a rectangular house and its garage have perpendicular walls that would form an inside corner but have a breezeway between them so that the walls do not meet? Will this structure produce strong echoes for people people in a wide range of locations? Explain your answers with diagrams. 6. The F-117A stealth fighter (Figure Q35.6) is specifically designed to be a non- retroreflector of radar. What aspects of its design help accomplish this purpose? Suggestion: Answer the previous question as preparation for this one. Notice that the bottom of the plane is flat and that all the flat exterior panels meet at odd angles....
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Physics for Scientists and Engineers 8ed - ch35 - end of chapter questions

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