A man is running through the park at a speed of 6.8 m/s away from a police car that is

traveling 23.8 m/s in the opposite direction. The siren has a frequency of 1,675 Hz.

What will be the frequency of the pitch heard by the runner?

A certain police car's siren emits at a predominant frequency of 1800 Hz ... at a speed of 30 m/s? ... frequency would an observer (at rest) measure if this siren were moving away ... a stationary observer: 343 m/s. 1800 Hz. 343 m/s 30 m/s. 1973 Hz