Question

A train is approaching the station. Explain what happens to the frequency of the sound as the train draws closer. What do you hear?

Answer 1

The frequency of sound waves goes up, so the pitch goes up as well. More frequent=higher pitched

Answer 2

Answer:

Frequency is more

Explanation:

If there is a apparent change in the frequency of sound due to the relative motion between the observer and the source, it is called doppler effect.

The formula for the doppler effect is

$f' = \frac{v-v_{o}}{v-v_{s}}f$

Where, f be the original frequency, f' be the apparent frequency, v be te speed of sound, v0 be the speed of observer and vs be the speed of source.

So, as observer at rest, vo = 0

$f' = \frac{v}{v-v_{s}}f$

Here, f' > f

So, the frequency of sound heared y the observer is more.