本题目来源于试卷: Doppler Effect,类别为 美国物理杯赛(Physics Bowl)
[单选题]
98.18: When a train is at rest, both a passenger on the train anm7skf qp2j. *nr ; e*ow w20wlsw9y jpd65qhs,d a ticket seller on ;5w,wwj ws2p*9 rhdseloq6 y 0the 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 hears a frequency of _____ Hz and the ticket seller hears a frequency of ____ Hz.
A. 120, 125
B. 115, 120
C. 120, 120
D. 115, 115
E. 120, 115
参考答案: E
本题详细解析:
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