How Does the Doppler Effect Alter Perceived Siren Frequencies at a Junction?

[loonwern93]

Homework Statement

A car stops at 50m to a road-railway junction. A train is moving with a constant velocity 35m/s towards the junction. If the train emits a siren at a frequency of 100Hz, calculate the maximum and the minimum frequency that can be heard by the car driver.

velocity of sound: 343m/s

Homework Equations

The Attempt at a Solution

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[ehild]

Do you know what v, vr, vs, f, fo mean?

ehild