阿摩線上測驗
43. When an ambulance passes in front of an observer, the sound frequency is 440 Hz when the
ambulance is approaching, and the frequency drops to 400 Hz when the ambulance is moving
away. What is the speed of the ambulance? (Assume the speed of sound is 345 m/s at that time.)
(A) 13.8 m/s
(B) 14.0 m/s
(C) 14.4 m/s
(D) 15.4 m/s
(E) 16.4 m/s
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統計： A(0), B(0), C(0), D(2), E(23) #3101794
統計： A(0), B(0), C(0), D(2), E(23) #3101794
