The frequency heard by an observer in the moving car as he approaches the police car is 558.6 Hz.
Frequency hear by the observer
The frequency heard by the observer is calculated by applying the principle of Doppler effect.
f₀ = f'[(v/v - vs)]
where;
- f₀ is the observed frequency
- v is speed of sound = 343 m/s
- vs is the speed of the source
f₀ = 500[(343 / 343 - 36)]
f₀ = 500(343/307)
f₀ = 558.6 Hz
Thus, the frequency heard by an observer in the moving car as he approaches the police car is 558.6 Hz.
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