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Siren

thephysicsguy

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I'm sure you notice that when something that has a siren like a fire truck drives by you it seems so much louder when it is driving right past you then when it is driving away from you this happens because of something called the Doppler effect because if the siren and you were both still you get frequency that hits your ears at the same time intervals however when it starts moving towards you the sound waves get closer and closer so you experience the waves in shorter time intervals which make it seem like the siren is louder then it actually is.

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