As a train starts from rest and then accelerates down the track,coming toward me faster and faster,the speed of the sound waves coming toward me will be
A)slower than the normal speed of sound in air.
B)equal to the normal speed of sound in air.
C)some constant speed faster than the normal speed of sound in air.
D)faster and faster.

Question

Quizplus · Accepted Answer

The speed of sound waves in air is determined by the properties of the air (temperature, humidity, etc.) and not by the speed of the source of the sound. Therefore, even if the train accelerates towards you, the speed of the sound waves coming towards you remains equal to the normal speed of sound in air.

As a Train Starts from Rest and Then Accelerates Down