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11 answers

... it's called the doppler effect. Sound travels in waves, if the source is moving towards you, the distance b/tw the sound waves is getting closer and closer. Thus, the frequency is increasing giving it a higher pitched sound. once the car passes you, the source is moving away from you, and the distance b/tw the sound waves is increasing. Therefore, the frequency is decreasing making the pitch progressively lower.

2006-11-12 14:17:07 · answer #1 · answered by jyl11002 2 · 0 0

if you're in a row boat transferring in direction of shore and drop issues interior the water to make waves at commonly used durations, an observer on shore will see the waves catch up with jointly as you proceed. it really is a upward push in frequency. The opposite should be actual in case you've been transferring faraway from shore. So, because the sound of a automobiles horn passes and recedes from you, the pitch of the horn ought to stay a similar, yet to you it will enhance and then Decreases. The Doppler outcome, named after Christian Doppler, is the substitute in frequency and wavelength of a wave as perceived through an observer transferring relative to the source of the waves. For waves that propagate in a wave medium, which contain sound waves, the speed of the observer and of the source are reckoned relative to the medium in which the waves are transmitted. the completed Doppler outcome ought to hence outcome from both action of the source or action of the observer. A source of waves transferring to the left. The frequency is more beneficial on the left, and decrease on the right.

2016-10-16 08:43:31 · answer #2 · answered by pellenz 4 · 0 0

Doppler effect. Sound waves coming from a moving vehicle are compressed by air pressure in front of vehicle, and expand as the vehicle is leaving. This is why a train horn is loud and higher pitched as the train approaches, and goes softer and lower in pitch as the locomotive passes.

2006-11-12 13:46:17 · answer #3 · answered by electron670 3 · 0 0

First, because the horn in located towards the front of the vehicle. Second, there is insulation between the firewall and the passenger compartment.

2006-11-12 13:36:06 · answer #4 · answered by brucenjacobs 4 · 0 0

It is the dopplar efect, as the noise comes toward you the sound waves are compressed and as it go's away the waves are farther apart making diferant pitch in sound

2006-11-12 15:11:05 · answer #5 · answered by xyz 6 · 0 0

It has to do with different parts of the sound arriving to your ear at different times due to the speed of sound and the speed of the car.

2006-11-12 13:36:07 · answer #6 · answered by sarcastro1976 5 · 0 0

I actually experienced this today. Really -- ! I thought about the very same question. So I went and researched it. It is known as the warp speed effect.

2006-11-12 13:39:51 · answer #7 · answered by Jawan Kasfaritan 2 · 0 0

Doppler Effect

read up on it

2006-11-12 13:36:18 · answer #8 · answered by alex_klawiter 1 · 0 0

I think the car got too close to a cat.....

2006-11-12 13:41:41 · answer #9 · answered by May I help You? 6 · 0 0

because it kinda fades when youre not the one moving with it, if you hear a honk go by you, its quieter when its further, louder when its closer, and quieter once it goes past you, am i making any sense?

2006-11-12 13:36:12 · answer #10 · answered by Anonymous · 0 0

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