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afrequency of the same as siren frequency as ambulance is the source and the observer this is not Doppler effect problem

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Q: The velocity of sound in air is 343 ms An ambulance is traveling east at 64.9 ms Behind it there is a car traveling along the same direction at 29.8 ms The ambulance driver hears his siren at a?
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Why ambulance is written opposite on front side of ambulance?

Bcoz the name written in opposite direction looks on the correct direction when viewed through the mirror so that is the reason…..if a vehicle going in front of the ambulance can read it correctly and give a way to go a head


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This is the doppler effect. If an ambulance is driving towards Jon, the sound waves are tightly stacked in front of the ambulance and are heard by Jon at a high frequency (high pitch). But behind the ambulance the sound waves are lagging because the ambulance is driving away from they sound waves (they are moving in the opposite direction) thus if Jon was standing behind the ambulance the frequency heard would be low (low pitch). The actual sound an ambulance makes is actually obnoxious, and if 100 of them drive by someone's apartment each day, it will make their head hurt and they will often think about why ambulances are so annoying.


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Why you can see the word 'ambulance' in the car mirror even though you are not looking at the ambulance that is behind the car?

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