Doppler Effect - 题库网 (tiku.one)

1#

98.18: When a train is at rest, both a passenger g8p 9mg m40juuo rgxkkd/4 fhk)/yal1n3( ow+on the train and a ticket seller on the station agree that the trains whistle produces sound at a frequency of j0km +/agwo(4xfur)lom p89yku4hg kd n/g13 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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2#

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08.18: A car is moving to the left at 20 mz;j)j. gy6d9y(jw uf r/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 frequency of the sou (rdguyj zyj6w9fj;.) nd 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#

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17.39: A point wave source travels along the x-axis at c iyd;8y+fodw;4 x bn;sonstant 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#

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02.47: A car heads toward a brick wall in a gwa /vbvt.vau1h. l(1crash test at 30 m/s. The horn is emitting a sound with frequency 250 Hz as it approaches the wall. If the air is still and/.avgav 1 (btu.l1vhw the speed of sound in air is 340 m/s, what beat frequency from the horn would the driver of the car detect?

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