Doppler Effect

Рет қаралды 241,584

9 жыл бұрын

108 - Doppler Effect
In this video Paul Andersen explains how the perceived frequency of a source depends on the motion of both the source and the observer. As a source approaches an observer the frequency will increase and as it moves away it will decrease. The same will occur for a moving observer. All waves (sound, water, and light) will experience the Doppler Effect.
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Music Attribution
Title: String Theory
Artist: Herman Jolly
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All of the images are licensed under creative commons and public domain licensing:
1. “Doppler Effect.” Wikipedia, the Free Encyclopedia, April 13, 2015. en.wikipedia.org/w/index.php?t....
2. “Doppler Effect.” Wikipedia, the Free Encyclopedia, April 13, 2015. en.wikipedia.org/w/index.php?t....
3. “Doppler Effect.” Wikipedia, the Free Encyclopedia, April 13, 2015. en.wikipedia.org/w/index.php?t....
4. “Edwin Hubble.” Wikipedia, the Free Encyclopedia, April 10, 2015. en.wikipedia.org/w/index.php?t....
5. “Edwin Hubble.” Wikipedia, the Free Encyclopedia, April 10, 2015. en.wikipedia.org/w/index.php?t....
6. “File:Speeding-Car-Horn Doppler Effect Sample.ogg.” Wikipedia, the Free Encyclopedia. Accessed April 15, 2015. en.wikipedia.org/wiki/File:Spe....
7. Tošovský, Aleš. En: Redshift and Blueshift of Light by Doppler Effect., March 27, 2006. Own work. commons.wikimedia.org/wiki/Fil....
8. Wiora, Georg. Deutsch: Rotverschiebung von Spektrallinien Im Optischen Spektrum Des Weit Entfernten Superhaufens BAS11 (rechts) Im Vergleich Mit Dem Sonnenspektrum (links).English: Absorption Lines in the Optical Spectrum of a Supercluster of Distant Galaxies (BAS11) (right), as Compared to Those in the Optical Spectrum of the Sun (left). Arrows Indicating Redshift.Español: Líneas de Absorción En El Espectro Visible de Un Supercúmulo de Galaxias Distantes (BAS11) (derecha), Comparadas Con Aquellas En El Espectro Visible Del Sol (izquierda). Las Flechas Indican El Corrimiento Al rojo.Nederlands: Roodverschuiving Te Zien in de Spectraallijnen van Een Supercluster Verre Sterren (BAS11, Rechts), Vergeleken Met Die van de zon.Tiếng Việt: Dịch Chuyển Đỏ, November 27, 2005. Removed jpg-quality degradation from Image:Redshift.jpg. Based on a public domain image created by Harold T. Stokes [1], and amended by Ian Tresman. Original upload in English Wikipedia by Iantresman. commons.wikimedia.org/wiki/Fil....

Пікірлер: 85

@krustomer 9 жыл бұрын

I know this isn't AP Biology but I have to let you know that on the AP exam yesterday, your videos helped so much, especially on the FRQs! I was the only one in my class to finish, thanks to you!

@mustafamalik4211 7 жыл бұрын

NOTE: Mr. Anderson's youtube logo is an example of the doppler effect :P

@ethanstewart3292 5 жыл бұрын

You are amazing at explaining things!!! Thanks

@WithASideOfFries 9 жыл бұрын

Perfect timing! I have a test on this stuff tomorrow; thank you!

@mollytrevaskis5995 3 жыл бұрын

me too dude me too hahah

@GeneralAumSum07 3 жыл бұрын

I know I'm 5 years late, but how was the test?

@jaywhypeesnon-existenttits7993 3 жыл бұрын

@@GeneralAumSum07 😂😂 i too wanna know

@LittleWaffle 6 жыл бұрын

Thanks for the video, very helpful!

@milos_radovanovic 9 жыл бұрын

1:25 All the light that he saw was moving toward him! All the light sources that he saw were moving away. :)

@drakerocky7808 6 жыл бұрын

Thanks you much for your videos man.God bless

@andreasnordin4713 5 жыл бұрын

Very good explaining! Thank you!!

@aishaalblooshi4278 4 жыл бұрын

Beast explanation ever, and beast physics teacher ever! Thank you 😊

@rachelanndorough1751 4 жыл бұрын

This made way more sense from your video! Thank you.

@niroshiniindima3725 4 жыл бұрын

So much more easier to do Doppler effect sums aftr watching ur video. Thank you

@alyzak.8997 5 жыл бұрын

THANKS! You're a life saver

@BITStudioCode Жыл бұрын

Best Video found on youtube, subscribed!

@momentouscrazynoob1709 2 жыл бұрын

Thank you so much for this video :D

@Popsickle950 9 жыл бұрын

Great video ! Interesting!

@mohammedaliyualiyu1855 5 жыл бұрын

Very good my Prof.

@kostyazubkov8538 6 жыл бұрын

super cool and understandable

@Bruh-be9rp 4 жыл бұрын

Muy buen video. Lo recomendaría.

@skybluecus7731 3 жыл бұрын

thank u sir , understand in depth

@AnkitaTiwari_no1 6 ай бұрын

Thank you so much sir

@syedhussain6183 6 жыл бұрын

Amazing!👍🏻

@CrazyCoupleDIY Жыл бұрын

Nice explanation thanks

@ibrahimalhajeri4658 8 жыл бұрын

Can you give me a objective question for a experimental design on the Doppler effect? (What is the effect of ... On...)

@iamethanwheeler 4 жыл бұрын

Carson, isn't the doppler effect this?

@lingkejiang9244 7 жыл бұрын

Wow the Hobb's thing was so cool

@PVComedy 9 жыл бұрын

I perfectly understand this effect and how it applies to sound, but why does it applies to light? Relativity sais that light always moves 300.000 km/s away from you, even if you travel at f.e. 200.000km/s. So how come the doppler effect also takes place with light if it always moves at the same rate away from you/to you etc...? I hope you understand where I see the problem here

@capitanobergeggi602 8 жыл бұрын

Man we are talking about frequency not velocity and light changes velocity in relation to the medium it istravelling through. Usually we talk about light speed considering the medium a vacuum

@cykj40 5 жыл бұрын

speed does not change, frequency does

@muhammadheroe6775 3 жыл бұрын

The doppler effect says about wave length not velocity..

@fishchronicles2873 7 жыл бұрын

i want to know if your in the car when it's honking, what would you hear?

@anemone9626 7 жыл бұрын

The frequency wouldn't change.

@thosemoments6193 4 ай бұрын

I watched this video in science physics. Well now I am a graduate and understood most of it except the color spectrum. Would you be available to Make a video in more depth to help people like me understand?

@soulephix 9 жыл бұрын

So, does Doppler radar mean we are talking about some sort of stationary antenna that is measuring the distance between moving storm airwaves...or something else? How does that work I wonder? Now that I understand the Doppler Effect better, I am curious to know how the radar would work...hmm. Thanks for the lesson!

@TaiViinikka 7 жыл бұрын

Bats do this with moths too, bounce a wave off them and listen carefully to determine the relative velocity of the meal relative to their ears. What the radar does is bounce off the droplets of rain and the frequency of the returned radio wave is shifted up or down depending on whether the wind is blowing the storm towards you or away from you. It can get more complicated, but most of the impressive stuff was already invented by the bats. :) Cheers.

@denimdinofan9 4 жыл бұрын

oh daddy andersen i cant~

@bronzejourney5784 6 жыл бұрын

Instead of giving multiple analogies for the thing you could have explain why is that happening.

@ericsu4667 6 жыл бұрын

Doppler Effect states that the frequency of microwave will be higher if a person runs toward microwave oven. Since the amplitude of this microwave does not change due to standing wave. The microwave actually become faster to the running person. vixra.org/abs/1705.0324

@PranjaliGupta12 7 жыл бұрын

is this why the in the evenings the sky looks blue and during sunset it looks red?

@carultch 3 жыл бұрын

No. The Earth is not spinning fast enough for the optical doppler effect to change the color of sunlight to an amount noticeable to human eyes. That has to do with selective scattering that our atmosphere does to sunlight. Higher frequencies are scattered as they pass through the sunlight, to form the diffuse blue background of the sky. Low frequencies continue without being scattered. This biases the color of the sun to be yellow-ish, and reddish at sunset when going through a lot thicker atmosphere, and the diffuse background is high frequency colors like blue. If you could see in ultraviolet, the ultraviolet light would also fill in the blue background of the sky. The sun's light is white, because it defines what white is to the human eye. "Add up" the diffuse blue background and the yellowish image of the sun, and you get the total light that defines what a balanced white color is to the human eye.

@Gameplayery 9 жыл бұрын

Would this kinda explain sunsets ? Or this has nothing to do with that?

@naughttube 8 жыл бұрын

+Rasti Al Not really. Sunsets are generate because a large portion of the 'blue' light is being absorbed by the atmosphere. During noon the light from the Sun has less atmosphere to penetrate before reaching your eye. At sunset tho, there's a lot more atmosphere for the light to penetrate and the shorter wavelenghts of light get somewhat filtered out. Hence the redishness of the Sun during sunset :)=

@patkun01 5 жыл бұрын

It's called Rayleigh Scattering

@ingainloggningsnamn 5 жыл бұрын

Nothing to do with it, well as far as I know there's nothing about the doppler effect that affects the colour of a sunset, and I can't see how it could. The reason it's red is because the light is passing through the atmosphere in a high angle and needs to penetrate more atmosphere. Why it turns red when light needs to do that I don't know though. :P

@ingainloggningsnamn 5 жыл бұрын

@@naughttube Ahh, but why is the sky blue in the first place if the atmosphere filters out shorter wavelengths? ;)

@aether-music 5 жыл бұрын

@@ingainloggningsnamn This is due to a lower amount of atmospheric particles to absorb and scatter the light. In fact, since lower frequency light tends to be scattered at a certain angle to the incident, lower frequency light gets "filtered out" and only the higher frequency light can be directly seen. At least, that's what I think.

@virsuryaircas 7 жыл бұрын

is that the sound wave diagram is circular or moving side front of the car has dungeon circles and the back of the car has free circles?

@tanmaydeshmukh3517 3 жыл бұрын

So did you learn

@LawatheMEid 7 жыл бұрын

why the sound wave that occur from moving source don`t gain or loss a speed equal to the source speed ..maximum speed in air is 330 m/sec why is this limitation?

@carultch 3 жыл бұрын

The speed of a wave depends on the restoring force and the inertial property of the medium. In the case of a sound wave in air, it is the adiabatic (i.e. no heat transfer) bulk modulus of the air, and the density of the air. It ultimately only depends on the identity of the gas or mixture of gases, and the absolute temperature. In the case of air, the equation is c = sqrt(gamma*R*T/M), where gamma is the adiabatic index of 1.4 for air, R is the universal gas constant (8314 J/kmol-K), T is the Kelvin temperature, and M is air's molar mass of 28.9 kg/kmol. Plug in T=273K for air at 0C, and get c=332 m/s as the speed of sound

@LawatheMEid 3 жыл бұрын

@@carultch thank you.

@splashindapot 7 жыл бұрын

When the observer is the one moving do the waves bunch up like when what's making the wave.

@BeauvanKoert 7 жыл бұрын

That's not important for this example. It simply could be the wind, that blows the water towards you in waves.

@Mrsrowett 6 жыл бұрын

When the observer is moving towards the waves the waves will bunch up (increase frequency) check out this simulation highered.mheducation.com/olcweb/cgi/pluginpop.cgi?it=swf::800::600::/sites/dl/free/0072482621/78778/Doppler_Nav.swf::Doppler%20Shift%20Interactive

@laizairis8484 3 жыл бұрын

uhm may I ask something? what does uniform distribution means?

@carultch 3 жыл бұрын

Uniform means there is no variation with space. The counterpart term to this is constant, which means no variation with time. Uniform distribution means if you examine each unit of either length, area, or volume, the quantity in question will be identical in each length/area/volume unit, as it is in the neighboring units. Think of the student population of a school, all gathered in the gymnasium. Suppose it is a private school, where the students wear school uniforms. The group of students will have a uniform appearance. The color of the school uniform, will be uniformly distributed across the group of students. By contrast, if the students each choose their own clothes, instead of wearing assigned uniforms, they will not have a uniform appearance. The colors of clothing will be diverse, across the group of students, and not uniformly distributed.

@erikjohansson9591 4 жыл бұрын

wow

@ask-wj2pf 6 жыл бұрын

👍

@lildisgrace1916 3 жыл бұрын

He clearly likes it!

@urlocalidiotd4281 3 жыл бұрын

@godsreddoor6345 3 жыл бұрын

Einstein's theory of Relativity = Doppler effect Same thing

@shivanshdogra75 7 жыл бұрын

do you work for khan academy!!?

@serene9532 6 жыл бұрын

shivansh dogra ...no

@realpsychonaut 4 жыл бұрын

you look like matt damon

@ingainloggningsnamn 5 жыл бұрын

0:56 For me it was the swan giving it away, not the waves, but I guess I'm simple.

@shah3err 4 жыл бұрын

I mean what

@karibeeranjayavelu477 8 жыл бұрын

cmon man you didn't derive the equation I learnt nothing new

@ryciacaminero9027 3 жыл бұрын

🤔

@lamyasms4656 6 жыл бұрын

"And the heaven We created with might, and indeed We are (its) expander.” (Quran 51:47)

@perfidiousprophet 3 жыл бұрын

Not even in physics. Just a curious musician

@mrpiff1744 4 жыл бұрын

Mmmmm yes da dopla effect

@almostthebest78 9 жыл бұрын

Egg

@stoicfloor 9 жыл бұрын

The Big Bang Theory, anyone?

@asimshah773 6 жыл бұрын

Big bang theory states that the universe originated billions of years ago in an explosion from a single point of nearly infinite energy..................actually i don't know much about it.........i've just rote the defination.

@teronroldan5012 5 жыл бұрын

I believe he is talking about Sheldon dress like the Doppler effect

@ingainloggningsnamn 5 жыл бұрын

@@teronroldan5012 ewww...

@carultch 3 жыл бұрын

@@teronroldan5012 It's the apparent change in the frequency of a wave caused by relative motion between the source of the wave and the observer.