Fire Engine siren demonstrates the Doppler Effect
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@cowcowpingpong typing in 'The Doppler Effect' lead me here
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Just watched this video in my GeoPhysics class today.
Everybody went "WOAH!"
We watched it again.
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republic poly gt no other videos to show ,so dumb
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Very good example!
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As it approaches: Frequency observed = Frequency of Siren (velocity of air / velocity of air - velocity of truck)
As it leaves: Frequency observed = Frequency of Siren (velocity of air / velocity of air + velocity of truck)
So long as the truck wasn't accelerating in it's motion (velocity was constant), the frequency shift was constant (neither increasing nor decreasing). You can observe this in the video between frequency as it approaches and leaves. The switch is instantaneous. Neat
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nice example
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Aaaahh......don't we all love science?
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@chrisgoding that's not an accurate explanation either. This happens because sounds waves appear longer when our distance to the source of the sound increases. As the fire truck passes by sound waves are compressed thus giving the illusion of a higher pitch, and as it moves away the pitch decreases.
it's all relativity baby
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I'm going to stick my neck out here and say that the explanation isn't quite spot on. It has nothing to do with how long something takes to return from an object it has hit - that's a transit time measurement. The doppler effect is actually the change in frequency caused by either a moving source or receiver. The fire truck is moving towards you so it sounds at a higher pitch than what happens when it is moving away from you. This is easy to detect because our ears are sensitive to pitch.
chrisgoding 3 years ago 17
Republic poly lead me here
cowcowpingpong 1 year ago 13