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Chapter 5: Q14DQ (page 1151)
The bottom of the passenger-side mirror on your carnotes, 鈥淥bjects in mirror are closer than they appear.鈥� Is this true?Why?
Yes it is right.
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For the old 鈥渞abbit-ear鈥� style TV antennas, it鈥檚 possible to alter the quality of reception considerably simply by changing the orientation of the antenna. Why?
Light of wavelength and frequency v passes through a single slit of width a. The diffraction pattern is observed on a screen a distance x from the slit. Which of the following will decrease the width of the central maximum? (a) Decrease the slit width; (b) decrease the frequency v of the light; (c) decrease the wavelength of the light; (d) decrease the distance of the screen from the slit. In each case justify your answer.
A person is lying on a diving board 3.00 m above the surface of the water in a swimming pool. She looks at a penny that is on the bottom of the pool directly below her. To her, the penny appears to be a distance of 7.00 m from her. What is the depth of the water at this point?
Monochromatic light is directed at normal incidence on a thin film. There is destructive interference for the reflected light, so the intensity of the reflected light is very low. What happened to the energy of the incident light?
On December 26, 2004, a violent earthquake of magnitude 9.1 occurred off the coast of Sumatra. This quake triggered a huge tsunami (similar to a tidal wave) that killed more than 150,000 people. Scientists observing the wave on the open ocean measured the time between crests to be 1.0 h and the speed of the wave to be 800 km>h. Computer models of the evolution of this enormous wave showed that it bent around the continents and spread to all the oceans of the earth. When the wave reached the gaps between continents, it diffracted between them as through a slit.
(a) What was the wavelength of this tsunami?
(b) The distance between the southern tip of Africa and northern Antarctica is about 4500 km, while the distance between the southern end of Australia and Antarctica is about 3700 km. As an approximation, we can model this wave鈥檚 behavior by using Fraunhofer diffraction. Find the smallest angle away from the central maximum for which the waves would cancel after going through each of these continental gaps.
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