  A train approaching a station at the speed of 31.0 m/s sounds the 2400-Hz whistle. Assume the weather conditions (temperature, pressure, humidity) as such that the speed of sound in the air is 341.0 m/s. What is the apparent frequency heard by an observer standing at the station?What is the change in frequency heard as the train passes by?

Question

A train approaching a station at the speed of 31.0 m/s sounds the 2400-Hz whistle. Assume the weather conditions (temperature, pressure, humidity) as such that the speed of sound in the air is 341.0 m/s.
What is the apparent frequency heard by an observer standing at the station?What is the change in frequency heard as the train passes by?

Step 1

Given: Speed of sound, c = 341 m/s

Speed of train(source), v = 31 m/s

Frequency of source, f = 2400 Hz

Find: Apparent frequency heard by an observer standing at the station.

Change in frequency heard as the train passed by.

Step 2

Apparent frequency is calculated when the listener and the source moving towards each other:

Step 3

The change in frequency heard as the train passed by or actual frequency is...

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Ray Optics 