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# Answer to Question #73475 in Mechanics | Relativity for santhosh

Question #73475
An ambulance siren has frequency 250 Hz. The ambulance is headed towards an accident site with a speed of 90 km/h. Two police officers on separate motor cycles head for the same accident site: one follows the ambulance with a speed of 80 km/h and the other approaches the accident site from the other direction with a speed of 80 km/h. What frequency does ambulance siren has for each of the police officers? Take the speed of sound equal to 340 m/s.
1
Expert's answer
2018-02-14T08:39:07-0500
We use the equation for the Doppler Effect:
f=(1+∆v/c) f_0
1) Police officer follows the ambulance
f=(1+∆v/c) f_0=(1+(22.2- 25)/340)250 Hz = 248 Hz
2) Police officer moving towards the ambulance
f'=(1+∆v'/c) f_0=(1+(25 - 22.2)/340)250 Hz = 252 Hz

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