A railroad train travels at in still air

PHYSICS · Multi-part · AP · Physics 2: Algebra-based · Waves Sound and Physical Optics · Waves Sound and Physical Optics

Problem

A railroad train travels at

30.0\ \text{m s}^{-1}

in still air. The frequency of the note emitted by its whistle is

262\ \text{Hz}

. Find the frequency heard by a passenger on a train moving in the opposite direction at

18.0\ \text{m s}^{-1}

. The speed of sound in air is

340\ \text{m s}^{-1}

. (a) Approaching the first train? (b) Receding from the first train?