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Looking down the railroad tracks at a railroad crossing, you notice two identical trains with identical train whistles. One train is at rest and the frequency of this train's whistle is observed to be $f$. The second train is moving away from you (you are at rest) at a constant velocity.

As the train moves away, which of the following is true regarding your observation of the moving train's whistle frequency?

A

The train whistle frequency of the moving train sounds the same as that of the train at rest.

B

The train whistle frequency of the moving train sounds less than that of the train at rest.

C

The train whistle frequency of the moving train sounds greater than that of the train at rest.

D

There is not enough information to determine anything regarding the frequency of the moving train whistle.

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