問題詳情
53. A police car with a 500 Hz siren is moving at 20 m/s. What is the total frequency change when
the police car is approaching and then leaving the listener? (sound speed in the air is 344 m/s)
(A) 32 Hz
(B) 36 Hz
(C) 48 Hz
(D) 52 Hz
(E) 58 Hz
參考答案
答案：E
統計：A:0,B:0,C:0,D:0,E:0
難度：計算中