問題詳情
47. A car approaches a stationary police car at 36 m/s. The frequency of the siren (relative to thepolice car) is 500 Hz. What is the frequency (in Hz) heard by an observer in the moving car as heapproaches the police car? (Assume the velocity of sound in air is 343 m/s.)
(A) 220
(B) 383
(C) 448
(D) 526
(E) 552
參考答案
答案：E
難度：計算中-1
書單：沒有書單，新增