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Speed of sound is approx 740mph a police car with its siren sounding is approaching you at 80mph at what speed is the sound from the police siren approaching you?
Wiki User
∙ 14y ago
The sound moves through the air at 740 mph, regardless of the speed of the source. The sound of
the siren passes you at 740 mph.
However, since the source is approaching you, more waves pass you each second than leave
the source each second. That's why the pitch of the sound from an approaching source sounds
higher than its actual pitch.
Also ... since the sound doesn't move away from the source any faster than 740 mph no matter
how fast the source is moving, that's why the pressure of the sound waves piles up in front of
the source when the speed of the source approaches 740 mph, forming what's popularly called
the "sound barrier".
Wiki User
∙ 14y ago
4193 Siddika Momin
740
Pansy O'Hara
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