Doppler Effect - 题库网 (tiku.one)

1#

98.18: When a train is at-gkkw)jull; ,*s1v+ f7ap em d rest, both a passenger on 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, the passenger healk,*+7)e- v;pwgm ks1u dlafjrs 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 m/s while a truck is mc, 2fx yx+s*m.e,pqghoving to the 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 oxx h*+ 2fpsmqge,yc,.f 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 source travels along the x-axis at constant sptf2k3hhr; 5yrr.tw yj* sa7 s:- - j6u;jpnkgjeed $v_s$. 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 a ,l:dubt.ph.wn t av0s68b q j4on0gp2t 30 m/s. The horn is emitting a sound with frequency 250 Hz as it approaches the wall. If the air is still and the speed of sound in air isthjugs dqwppa.o8 lnbt0b ,4n v:6.02 340 m/s, what beat frequency from the horn would the driver of the car detect?

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