Constructive and Destructive interference | Physics | Khan Academy

In this video David explains what constructive and destructive interference means as well as how path length differences and pi shifts affect the interference. Created by David SantoPietro.
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Physics on Khan Academy: Physics is the study of the basic principles that govern the physical world around us. We'll start by looking at motion itself. Then, we'll learn about forces, momentum, energy, and other concepts in lots of different physical situations. To get the most out of physics, you'll need a solid understanding of algebra and a basic understanding of trigonometry.
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[@VipulPatel-mf3yl]

I did undestand in 13 min which i was not able to understand whole year

[@gpurkeljc]

When two waves are half a wavelength out of phase we get the silence of the lambdas. 😎

[@samyukthasrikanth4214]

Okay I laughed. That was clever 😂

[@onyiturner5345]

Gold!

[@zigzag8338]

nice

[@IsrarKhan-kb9hs]

What does it mean?

[@sdpto]

​@@IsrarKhan-kb9hs it's a play on Silence of the lambs

[@l.fsader6021]

When someone is changing phases in life, what was once constructive becomes destructive. and then it becomes constructive. and then destructive. and the.... but the wave is always the wave. ya feel me. lol

[@marcus3161]

bruh u must've been baked when u wrote this comment lmao

[@starrynight1601]

Lol😂

[@roseoid9672]

@@marcus3161 You'd be so goddamned correct

[@pHocusKeeperzEdutainment]

An Elder just broke it down to me the other day that why I’m here!!

[@justdoit143]

Second time, it becomes suprisingly understandable

[@soumyagangwar824]

Indeed 🤣

[@mvl3713]

If only RUclips was around in highschool. Great style of teaching

[@ujjwalnegi8259]

Khan Academy always expresses better

[@diyadahal5384]

100 million dollar worth video

[@ZelForShort]

This is the best thing I've learned all week ily

[@marisacasciola7287]

This helped soooo much. I tried reading my textbook and it still couldn't explain this concept to me very well.....

[@Gaurir5]

Most wonderful explanation... Loved it

[@ronniesawyer]

Thank you so much khan academy. This style of slower teaching really helps.

[@mystery_1155]

Thank you, David ♥

[@401ammarfarooqui4]

WOW! Concept Clarity to the next level.

[@perceptionshare2248]

Great video. Thank you for sharing your perception.

[@maheshanand1580]

Very Clear explanation...thank you

[@Essahwarlord]

what software is that to draw waves in layers and bring layers back and forth?

[@elesia610]

one of the best video on youtube to explain this concept

[@sasikalamuthusamy2385]

Marvelous teaching keep uploading 💥

[@sabakanwal7801]

Jazak Allah u r a lifesaver

[@electrotoxins]

Thanking God for translating technology to let me read this beautiful comment

[@homegardening2766]

OMG,2 HOURS AND 5 MINS!👌

[@beenarajan9982]

Brilliant explanation sir....thank you

[@tehminalatif6438]

Very Very Understanding Concept! :) Great video!

[@bixstar1469]

I finally found it, thank u KA

[@jayalekshmiareesh7811]

Thanks for the info.that was very useful to us.

[@nehamahato4106]

This was so so good. Thank you🤍

[@MenahilMustafa]

I enjoyed the lecture and understood , I love this. Imma subscribe.

[@cristianaguilar8445]

Hey sir thanks, Im from mexico and this is a very clear explanation! God bless you!

[@obsessedforgoal2455]

no words to explain your skills and concept of physics whenever i stuck i come to @khan academy

[@kpoli7494]

immense thanks for clearing the concept

[@vikramjoshi3452]

This a soooo great🙌🏼

[@biyanpertin7655]

Thank you this really helped🙏❤️

[@dhimahimehta9815]

Very much helpful....Thanks a lot

[@mehdiali5794]

Nice explanation

[@adheenadev7403]

so good. thank you❤

[@IsrarKhan-kb9hs]

Aahhhh this is heaven the best video i have found till now i m soo thankful i found this channel ur concept is hats offf no words brilliantly awesome

[@moonknight9054]

AMAZING VIDEO!

[@88red]

thank you so grateful for your help u are helping many students out ❤

[@quriositysquared1028]

This is amazing

[@nidhikushwaha8481]

wowww difference between constructer and destructer is in very easy language👍👏👏👏👌👌👌

[@rich1051414]

This is why 2 notes which are not the same sounds like 'wah wah wah', because the wave length of one is not divisible by the other so one wave will continuously move in and out of phase of the other other.

[@himira5771]

Genius, i finally understand this 👏

[@CaseyRedDragon]

What happens to the energy during Destructive interference with the Law of Conservation of Energy?

[@bobnavonvictorsteyn9017]

CaseyRedDragon
This is a very good question. Just commenting so I also get a notification if anyone answers

[@shanivaar1671]

energy is only redistributed...if it reduces in one area due to destructive interference forming a dark spot then that energy is compensated for in another area as a bright spot by constructive interference...look up young's double slit experiment

[@humeras3359]

Excellent ❤️

[@shahadjabiti1645]

Thank you 😊

[@muhaivlogs8997]

thanks bro

[@awsomecube0078]

This is awesome 👏

[@ysx2030]

Brilliant !!!!!

[@mackenzievick1736]

thank you david

[@shrutirathore6000]

Superrrrrbb keep doing

[@nidhikushwaha8481]

thanks avanish

[@muznatrendyfashion]

My qtn is that destructive interference occur when they are out of phase.....but u gave the condition of interference with in phase

[@grucy953]

thank you worth watching

[@alimukhtar4759]

Thanks David. 😊

[@muqrisalmardi1791]

Thank you so much

[@fernandohood5542]

What if i have a transmitter and receiver at one end and a reflector at the other. What will the reciever see as the reflector is brought closer?

[@joshijoshi5669]

nice video

[@mspasstime9284]

Thanku so much🎉🥰

[@practicalcentre1840]

I have to ask a question that same is gonna be happen with compressions and rarefactions cuz sound waves are longitudinal.

[@TomHendricksMusea]

Consider electron wave and positron wave are the same but out of phase.
So there is only one charge that can either be constructive, same charge, or destructive, different charge.... more to follow.

[@jaewonchoi1168]

Y'all ma hero

[@juanfelipe8484]

What software is he using for the drawings?

[@arunlohi7377]

Damn that was nicee 👍

[@swetachoudhary987]

Best video

[@kshjnbvsmd]

thank you

[@najmuschowdhury1766]

amazing

[@hilariousentertainer8197]

In which case constructive and destructive waves are formed? What is the reason to form two types of waves ?

[@reysm1522]

Does this apply to wifi signals? More waves more energy per cycle?

[@thomasgraham3445]

This is too lit

[@cadcamsystems]

good

[@dilomine1352]

Does this apply to electromagnetic waves aswell?

[@trigobrooken6260]

yes!

[@shivensaini3643]

Yes, it is valid in wave optics

[@saragreen1143]

bless y'all

[@pdfgovardhanb8093]

nice

[@dddd2319]

Thank you Jesus for this man

[@user-co8kq8cc9k]

can light be the constructive wave or destructive wave ?

[@qiuk5988]

what if source 2 creates a wave with smaller amplitude but same wavelength, when is it in phase or out of phase

[@qiuk5988]

and do they have to line up perfectly together to get const and dest? or it depends on which one will be closer

[@yunglilschillymane261]

Lets say we have a light bulb that emits one wavelength of red light. Since this is not a laser it will not produce coherent light and all the photons emitted have a random phase( i think). Will this red lightsource now be dimmed by its own random phase photons that on average cancel eachother out due to destructive interference? and if this is the case does this also happen in our traditional lightbulps with lots of wavelengths? and if not why?

[@injourney7147]

thank u so much sir : )

[@shukfahid]

FOUNDATIONAL!

[@SuperSalazar94]

What about 2 paths for one source?

[@frankivinstutoring3775]

Can anyone explain what happens to the ENERGY of two waves if they are perfectly destructive? It seems as though energy is destroyed, but this doesn't seem possible.

[@Misada678]

i have a difficult examen thank you please everyone wish me luck

[@VipulPatel-mf3yl]

I have today

[@Misada678]

THE SHIELD X u can do this ☺️

[@VipulPatel-mf3yl]

@@Misada678 ty for wishes

[@mystoryinrhyme5683]

Peak to valley or antinode and node=1/4 wavelenght i thought

[@lemon-vy3mj]

Me: Opens Video
Also Me : Why the heck is the voice different Isn’t THIS KHAN Academy?!
Me Again: oh wow I’m dumb -,-

[@muhammadfaheem910]

Thanks sir .....i lerned very much from this video ...i m from Pakistan

[@muhammadfaheem910]

@@aliaomer8298 sorry i couldn't understand you.....what dou you want to say.. plz....

[@thescratchsavy1587]

Is this somehow related to resonance?

[@deweyambas9687]

nc

[@michaelschuler7397]

Can this happen with microwaves

[@hackeroo13]

Why not?

[@akaBaye]

I​ thought destructive interference was superposition. ?

[@Chromedesu444]

the concept of constructive/destructive INT, is under the umbrella of superposition

[@joshuawall6265]

Where is SAL????

[@hackeroo13]

Isn't a wavelength: one crest + one trough

[@ezzeldin3714]

I think so

[@abrarazad1571]

That ear tho

[@kusumsharma5195]

:-)

[@mohamadrahim8406]

طالب سادس زيروغيمس جلقم بلكم بلمم

[@epenmedi]

wer PI shifted

[@epenmedi]

includes destructive interference

[@epenmedi]

at least two wave bands were at curves where tan=0 have a 180 rotation.

[@004_sreelemonchandramohont9]

presentation is not good so speed talk ...
and unnecessary talk is too much
presentation should be slow because this video is watching over the world

[@shanetrompeter]

This guy knows nothing about how noise cancelling of sound waves. He was showing for noise cancelling is a standing wave then his constructive wave is a is a harmonic wave. Then when he inverted the wave that is noise cancelling. he really has never done any work in a true sound wave lad. The car companies I work for as a sound engineer know what those waves do and how waves really work. Then a destructive wave means a harmonic that can destroy things a vibration that breaks something. (THANKS FOR MISINFORMING PEOPLE)

[@gomathinaayagam7941]

shane q please explain how sire

[@piurexroa]

Man shut up

[@asdfkjhlk34]

Lollll I hope you’re joking

[@AirdropFinder1]

Is it true .

[@neh1234]

Tell that to sound engineers. For the rest of us who just need to pass physics class, this is enough.

[@MrWolfchamp-xi3cu]

This isn't helpful at all. He didn't even give any good physical example. Just lines on a screen. The sound cancelling headphones isn't a good example since you can't see sound. He should have showed two water waves.

[@TomHendricksMusea]

Consider electron wave and positron wave are the same but out of phase.
So there is only one charge that can either be constructive, same charge, or destructive, different charge.... more to follow