試題詳解

【已刪除】(試題疑義：無答案)57. A police car chases fugitives on the highway at 144 km/hr, its siren emitting sound at a frequency of 500 Hz. What frequency is heard by a passenger in a car traveling at 108 km/hr in the opposite direction as the police car and car approach each other? Assume the speed of sound in the air is 345 m/s.
(A) 420 Hz
(B) 495 Hz
(C) 545 Hz
(D) 595 Hz
(E) 625 Hz