Question

A train whistle is 580 Hz when stationary. It is coming toward you at 18.8 m/s. What frequency do you hear?

Answer 1

Answer:

612 hz

Step-by-step explanation:

580 + (580 / 343) * 18.8

=  612 Hz.

Answer 2

Answer:

612 Hz.

Step-by-step explanation:

The frequency of the sound  will be proportionally higher when coming towards you. The increase is related to the speed of the train.

So the frequency will be:  

580 + (580 / 343) * 18.8

=  612 Hz.

This is called the Doppler effect.