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习题练习:Doppler Effect

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

答题人: 游客未登录  开始时间: 24年07月31日 22:30  切换到: 整卷模式

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  98.18: When a train is at rest, both a passenger onz u,s sa6 m7 jf,r/z)/gs/us n*n.idew the train and a ticket seller on the station 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, n7sj z dsssu6a),wfe z,m /in./ur /g*the passenger hears a frequency of _____ Hz and the ticket seller hears a frequency of ____ Hz.

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  08.18: A car is moving to the left at 20 mv6 955cbaksym3kgg 4 b/s while a truck is moving to the right at 25 m/s. If the truck emits a sound of frequency 5000 Hz, what is the perceived freqbyb3 kga6k954v 5gsc muency of the sound by the driver of the car? Assume the vehicles are moving directly away from each other on a $20.0^{\circ}C$ day

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  17.39: A point wave souc1 qyr70m+mhrrce travels along the x-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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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  02.47: A car heads toward a brick wall in a crash test at 30 m/s. The horn is7mf: o r-gxg.ys ( xw8c(-wbsxmx8of: emitting a sound with frequency 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 thef-(x.o bog7xwg 88fws-x s(:c r m:ymx horn would the driver of the car detect?

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