Physics 19 Mechanical Waves (11 of 21) The Interference of Waves (Same Direction)

[@Rogue_Art]

I can't believe I looked at these huge equations with cosine, sine, and lots of variables and though they were simple! It's amazing how good you are as a professor, taking something so complicated and making it seem basic. Thanks a lot for your excellent teaching, professor!

[@MichelvanBiezen]

We appreciate your comment.

[@barbarazavala8560]

this lecture was so helpful! i especially loved the way you really explained the phase shift and connected it back to the diagram. thank you!

[@MichelvanBiezen]

Glad it was helpful!

[@akhothegrade9664]

michel van biezen is great at teaching concepts, organic chemistry tutor is greate and clarifying the maths

[@MichelvanBiezen]

Glad you think so. 🙂

[@valeriereid2337]

Thanks for this lecture. You are the best at explaining.

[@MichelvanBiezen]

You are welcome and thank you.

[@marcusinfestus1333]

I came for the education. I stayed for the bow tie.

[@MichelvanBiezen]

😂😂😂

[@shreshthawadhwa7231]

ur vids need more views!! Your teaching is a lot better than my physics professors :)

[@Peter_1986]

One good rule of thumb while learning math and physics is to make sure that you can derive formulas etc on your own, simply by thinking about what happens in that scenario.

[@Shark323-h3e]

Professor, thank you for the astonishing explanation, I am wondering whether having the formula: A sin (wt - kx - Φ) instead of A sin (kx - wt - Φ) will affect the calculation , curriculums differs and sometime that gives me sort of confusion. Thank you

[@OkanTandogan]

Thank you very much for these amazing videos. Is it possible to explain mathematically the addition of two incoherent waves?

[@MichelvanBiezen]

Yes, you can add two non-coherent waves. That mathematics is more difficult.

[@RobynDish]

This is great!!! Thank you

[@sbulelenqophiso7239]

Well explained, thanks sir

[@MichelvanBiezen]

You are welcome. 🙂

[@spyhunter0066]

Can you check if your summation wave has been drawn wrong , or not? It's because it has to start phi/2 from the right in comparison to the 1st y1 wave due to the phase shift. You started it from the origin, which I think it might be wrong.

[@manzidelick2752]

this is was so helpful!!! Thanks for the awesome explanation.

[@MichelvanBiezen]

Glad it was helpful! 🙂

[@manzidelick2752]

@@MichelvanBiezen Sir can you help me with the link for a video showing a summation of waves, in the case where they are many, thanks.

[@MichelvanBiezen]

We don't have an example with more than 2 waves, but the method is exactly the same. You add the values of every one of the waves for each value of x

[@abhishekbidhuri]

Great explanation sir

[@MichelvanBiezen]

Thanks and welcome

[@payaldubey8599]

Thank you very much All doubts cleared

[@MichelvanBiezen]

Glad to hear that

[@way_to_physics0763]

Grate explanation❤️ Thank uh sir

[@yopenzo]

Thank you very much.

[@MichelvanBiezen]

You are welcome! Glad it helped.

[@fie4426]

So when light moves slower through a medium that's because the wave caused by the electron is slower than C which causes the speed of the new wave to be slower than that correct?

[@MichelvanBiezen]

Actually it is a bit more complicated than that. (If you search the internet, you will not find an answer to that question (that actually explains why light moves slower through a medium)). The speed of light is determined by the permittivity (electrical field) and the permeability (magnetic field) of the medium the light is traveling through. The permeability is not affected much by the change in medium, but the permeability is. Since the speed of light equals 1 / sqrt [ (permittivity) x (permeability}] the speed of light will change exactly as predicted by the new permittivity of the medium light is traveling through.

[@fie4426]

@@MichelvanBiezen Alright, thanks!

[@paulprojestus1736]

Good work!Thanks Dr.!!!

[@himindukularathne7075]

i think resutant wave at t=0 is incorrect because y2 is not considered

[@MichelvanBiezen]

The equations in the video are correct. Thank you for checking.

[@andreistratu2984]

Hello Michael Biezen, i have seen in previous videos that you used cos function and in this one sin function. Based on what do we use cos or sin? Thanks in advance!

[@MichelvanBiezen]

If you apply the sin or cos function in the "real" world you will find that there is essentially no difference except that there is a 90 degree phase difference between them. You can look at the function at t = 0 or x = 0 and determine if the sin or cos matches the function

[@FR33Willi]

this is genius

[@jayypower]

Insightful

[@bios546]

It really reminds me of when two atoms combine... in the LCAO, the two wave functions the psi1 and psi2... thats more complicated than this... that was in chem for me... I'm right now in 11th... so, how are those waves(orbital wave) and these waves related?

[@MichelvanBiezen]

ess This is basic wave theory at the macroscopic level. The electrons in atoms are subject to quantum mechanic laws. Take a look at the kzbin.info/aero/PLX2gX-ftPVXXIA0pKC26EyXqYp2yxBidH playlist

[@bios546]

My gosh! I thought u taught only phy... wow!!! ma'an... I must keep my eyes open... the chem too!!... wow... now u are greater!... and... thank you sir!... tytytyty

[@kiokomulei8163]

good lecture. but "cos1/2[(kx-wt)-(kx-wt-@)???

[@curtpiazza1688]

THANX again!

[@MichelvanBiezen]

You are welcome. 🙂

[@alexindustries44]

Hello, Does the destructive interference of Light or (EMR) mean that the energy is lost or something like that ,how can that be, im searching for an answer but haven found it yet?

[@MichelvanBiezen]

No, the energy is not lost. It is very much like watching waves come in, hit the breakwater and then return back to sea. When the outgoing wave encounters an incoming wave, there will be a moment when both waves "disappear" and then a moment later a single wave twice the height of either onw will appear before they move away from one another.

[@alexindustries44]

@@MichelvanBiezen alright i get that on two waves in oposite directions ,but does the same aplies to when a wave of EMR passes on a thin film and it creates two but out of phase by 180°? ,in that case the sum of the two waves in every point would be 0 ?

[@alexindustries44]

I remembered that when light refracts is actually that the material is creating anoter electromagnetic field and so the new EMF interfere in multiple direccion with the received light, thus the result is (like) a change in direccion of the incoming light. So the energy of the incoming light is the same that the new light "created" and the "destroyed". In these case it must be that when destructive interence happens, the energy that was meant to be in that direccion is instead part of the transmited light on the thin film

[@Rooh-pj5yi]

In y2 we take th phase difference negative and in our book it is positive why you cannot take it positive?

[@MichelvanBiezen]

You can go either way.

[@Rooh-pj5yi]

@@MichelvanBiezen okay By the way The lecture was mind blowing

[@MichelvanBiezen]

Thanks!

[@李小兵-f3k]

awesome.

[@amandaarans2178]

lovellyyyyyy

[@sandeepmzp59]

👌👌👍👍