As a Train Starts from Rest and Then Accelerates Down

question 27

Multiple Choice

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.

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