Doppler Effect - 无忧得胜-网上国际课程 (5edu.win)

?作业考试练习?美国物理杯赛(Physics Bowl)?Doppler Effect

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习题练习：Doppler Effect

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作者: admin 发布日期: 2024-07-31 22:30 总分: 4分得分: _____________

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98.18: When a train is at rest, both a passengeytyd4 0; guu 4p5vm+8xg7rd/hnjb:yl r on the train and a ticket seller on the stdy d/uy4hyrtu7b nlg v jx0;g+ 845p:mation agree that the trains whistle produces sound at a frequency of 120 Hz. When the train is moving away from the station at 15 m/s, the passenger hears a frequency of _____ Hz and the ticket seller hears a frequency of ____ Hz.

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08.18: A car is moving to the left at 20 m/s while a truck is moving to lac w-7/m0k czthe right at 25 m/s. If the truck emits a sound of frequency 5000 Hz, what is the perceived frequency of the sound by the driver of the car? Assume the vehicles are moving07 -lza c/wckm directly away from each other on a $20.0^{\circ}C$ day

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17.39: A point wave source travels along the xjc ;owyq (ryx8pgb/(u0 -wmh9-axis at constant speed $v_s$. Stationary observers on the x-axis measure the wavelength of the waves that they receive. The ratio of the wavelength measured at a location behind the source to the wavelength measured at a location in front of the source is 1.50. If the wave speed is v, what is the source speed $v_s$?

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02.47: A car heads toward a brick wa2-glhb5m lxw bh(9xy6ll in a crash test at 30 m/s. The horn is emitting a sound with frequency6ll-b bmw5hxg(9h2 yx 250 Hz as it approaches the wall. If the air is still and the speed of sound in air is 340 m/s, what beat frequency from the horn would the driver of the car detect?