A police siren emits a sinusoidal wave with frequency

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

Problem

f_s=300\ \text{Hz}

. The speed of sound is

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

. (a) Find the wavelength of the waves if the siren is at rest in the air. (b) If the siren moves at

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

, find the wavelengths of the waves ahead of and behind the source.