Doppler effect - listener in motion

[rodswebdesign]

some really good stuff here

[DevaXfish]

nice!!!! for share

[DennisBayazitov]

NEEEEEEEEAUUUUUUUUUUUUHHH

[frompdiggity]

Note to self.....do not view video while under the influence of psychedelic hallucinogens.

[TrojanJerichoVI]

... there there.

[raizentoushi]

is the green one moving or the other( in this video not in reality)...btw....is anyone else here because of Sheldon?

[PumpManufacturers]

thanks

[imdbstar]

how can anyone dislike this. n00bs

this is the really cool

[woogr]

An example could be a police siren, when it is far away you can slightly hear it because not that many sound waves are reaching you but the closer it gets the more waves there are reaching you thus making the noise louder then when the police car goes further away and carries on going and less sound waves reach you this causes the sound to decrease thus the Doppler Effect xD please correct me if im wrong im 16... xD

[PelletierPhysics]

@woogr Doppler effect does not cause the sound to become louder of softer. It makes the pitch higher or lower.

[lamdavld]

@PelletierPhysics However, you're brain perceives certain frequencies to be louder or softer. Though you are technically correct.

[ThatsDaStuff]

i'll give you a hint. nnnneeeeaaaawww (big bang theory)

[R33seyboy]

@ThatsDaStuff +1 love that tv show

[gnamp]

This video requires an accompanying sound track.

[misantropicall]

when observing the DE, is there any difference between: a) the sound source moving towards/away from you, and b) you moving towards/away from the sound source?

[Thanatos659]

thumbs up if you came here from Big Bang Theory

[Opticradiation]

Part of me was expecting something scary to pop out.

[Peon547]

wow this is logical

[tomowashere2007]

Doppler Effect. the apparent change in frequency caused by change in the realative motion between the source and the observer

[iloveredsox7020]

and so happens the red and blue shifts

[sharpezor]

This is a good animation

[leafrunner123]

Doppler effect: Change in frequency of a wave due to the motion of the source or the observer.

[kebabsallad]

So it shows that when he moves towards the source he hears it in a way that changes when he is moving away from the source ? more freq when moving towards or ?

[Igneous01]

k what really happens here is that when the waves are being ommited from the device (lets say a speaker for example) u moving towards the waves, is alot like moving against wavs in an ocean, they hit you more frequently since the distance between you n the wav become shorter as you also move. So you will hear a slight raise in the pitch of the music. When u walk away, ur actually creating distance between urself and the wave, making the freq slower, and lowering the pitch.

[purplepirate1109]

ahh! thank you for this

[PwNStaaRR]

It is the change of frequency of light when an obverver moves relative to a light source.

[HLSDK]

yes, It is called red shift (if distance is increasing)

[BlackhawkII]

it neeed not be light ;)

Just watch a Formula 1 race: When the car comes closer to you, the frequenzy gets higher, if it moves away, the frequenzy gets low(er) again ;)

[theK0OKS]

but.. shouldn't the sound-maker be moving to cause any shift at all? I mean, if an object is not moving, you only hear someone louder or less loud when moving towards that person, not higher or lower pitched.. :O Or not? Am I completely wrong? Help me out xD

[jakehr3]

yeah, i know it seems strange, but in the doppler effect equation the listener's position and velocity is also taken into account as well as the emitter

[JohnF30Music]

What i don't understand is, say that each wave represents one beep, won't the person be just hearing more beeps if he moves closer to the source? It seems to me like the person would just hear more beeps, not higher pitched ones. i can't explain

[franksui]

no. each circular line represents a wavelength. i.e. from one circle to the adjacent one, that's one complete wavelength. When the green person moves towards the red person, he goes through more wavelengths per unit time. and more wavelengths per unit time means shorter wavelength, which means a higher frequency. when he moves away from it, he goes through less wavelengths per unit time. and gives a longer wavelength, which means lower frequency. ( v = f * λ ; "v" is always the same)

[Joester9988]

but i though that the lines werent beeps, they was them frequency lines (dunno there exact name) and then when hes moving towards it the lines are closer together so higher frequency means higher pitch and when he moves away the lines are further apart so lower frequency means lower pitch ? might be some bits switched around in it but im not sure, im only 13 lol

[agnosticwolf]

excelent, points out the doppler effect isnt just for those speeding cars maving away from us

[dilzo999]

woohoo red shift

[mvpetri]

Great vídeo!

[as4spice]

i still don't know what the doppler effect is

[defm1]

It is the change in frequency and wavelength of a wave for an observer moving relative to the source of the waves.

[Brax115]

As you are moving at the sound source, the sound is a higher frequency because sound waves are hitting you more frequently, while when you are moving away from the sound source after you pass, the sound is a lower frequency because the sound waves hit you less frequently since you are moving with them rather than against them.

[scumhearted]

thanks a million brax

[QuiltedPine]

Holy cow, you've just demystified somethign I never understood and was too ashamed to ask!

Essentially if you move as fast as the speed of sound, you will approach near 0Hz!

Amazing!

Thank you!!

[fatqwert200]

@Brax115 so does that mean if u were traveling faster then the sound lets ignore other variables but for sake of argument if the sound was 500 hz and you were going the speed of sound. will you hear nothing on the other end? and if you were going twice the speed of sound will you hear 500 hz on the other end

[blazesoul13]

@fatqwert200 If you're travelling away from the sound origin and at the speed of sound you'll hear nothing. If you go away from the origin and twice the speed of sound you'll listen to everything at the original frequency, but backwards :D

[Albastrica]

@Brax115 Like the ambulance: when coming at you the noise is fast, when going away from you, the sequences are slower. Fun :)

[PrincessHeart1997]

@Albastrica ahhhh i get! :L Exsamples are much easier, i hate ambulances, the noise is scary when your listening 2 ur ipod on loud then it ends and there a big siren suddenly.

[farerse]

the dopler effect is a green guy passinng by a red guy emitting circles

[mos3ad2006]

nice video

[999manman]

Consider me sufficiently doppled!!!

[4take4give]

That is not possible, surely you jest.

lol

Great video.

[Max11551]

Elucidating. Thanks! :)

[blaze24x]

great video

[gwynnhwfarr]

fine, however it'd be great if you added some voice to explain ppl how it works ;)

[CyberShr0om]

I agree... 0o

[Rodr1goM1randa]

ok......................