The equation of a wave | Physics | Khan Academy

This is just awesome. You couldn't have explained it any better. Thank you!

Thank you so much sir i understand

How can you intuit that if the wave moves to the right, then one subtracts off ωt or 2πft?

Isn't it supposed to be +ve when the wave moves towards the right and -ve when it moves towards left ??

I have a doubt
Isnt the wave length and 2pi equal
So y can't they be canceled out

This guy made it so simple

Shouldn't it be y(x,t) = A cos((2π/λ)x - λft) where f is the frequency of the wave. This is because the λf will give the speed of the wave. Multiplying it by the time (t) will give us the horizontal distance covered by the wave which we can simply add or subtract to (2π/λ)x depending on where you want the wave to go.

thank you! Watching your video is better than listening to 2hour lecture from my professor

Within fifteen minutes the clouds obscuring my view blew away and light fell upon the subject. This video was brilliant. Well done and thank you.

Can u find the speed of the wave from this function?

eureka moment, loved this !!

Broo I love this lecture its truly amazing

❤❤❤❤❤❤❤❤❤😊

Brilliant !!

Great Video thx

Why are many of the viewers so satisfied with the video but do not leave a single like in it.

Amazing😍.
Sir why the wave is shifting towards right when we subtract and towards left when we add?

Superb bro I never expected to maths be understandable but my vision got changed after watching your vid😊

thank you very much for this ! this is extremely important when learning how to be a musical sound engineer/audio engineering when mixing and mastering rock n roll music ! lol :)

Hi, what do you use to write your notes in your vids? Thanks

why the x is not negative like too?

Now I understand.

And after 7 years... (currently 2024), this video is still easier to understand than spending hours at lectures😂🎉

I have an exam in 4 hours, 😅 and this video made about 50 pages slide irrelevant 🎉😂

thank you !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! you can't imagine how grateful I am!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!1

How is sal

Sir this is what I was searching for days.... Thank you so much ❤

Hey, small question,.. why does adding phase imply the wave is going to the left?? And for a sin wave starting going up above the x axis, is the equation asin(wt-kx) or asin(kx-wt)????

Thank you so much for the video! I was really confused about this topic.

wish u were my physics teacher....lecture wouldn't be that boring

Thank you

Even a 10 th class student can understand this very properly explained thank you sir😊

amazing explaination

understood nothing out of my textbook intuitively but now i clearly understood this

Please what software do you use in creating this video it's so amazing

I’m studying 12th grade physics in Spain and this video really helped me. Thanks

very well explained, the only question is why the time term is being subtracted when we move to the right. because when we move to the right, the time is passing, so we must add the time term. kindly explain this, I am in a really complex state of mind rn.

very nice
really impressed

But then it's Khan!

Thank you so much sir for this video it made me clear about wave equation

people should fund khan academy more. This organization is literally life saving for my classes.

Where is SAL?! 😢

TYSM

btw how do u put those equations in a calculator

Profound explanation

can I ask why it has to be negative when the wave travels to the right?

Thank you very much. excellent presentation...

This was well-explained. Good job