A stationary siren emits sound waves of wavelength 0.40 m

PHYSICS · Subjective · A Level · Physics · Waves · Waves

Problem

A stationary siren emits sound waves of wavelength 0.40 m, which travel through the air at a speed of

330 \text{ ms}^{-1}

. When a car approaches the siren at a speed of

20 \text{ ms}^{-1}

, the driver of the car hears sound waves with a wavelength of