Two Slit Interference | Physics with Professor Matt Anderson | M28-18

When light goes through a single slit, you get an interesting diffraction pattern: the light spreads out but also has ripples. What happens if you now add a second slit? Thomas Young in 1803 demonstrated this to the Royal Society. The crowd was stunned to see that by adding a second slit, essentially adding more light, you can in fact remove light from certain sections on the distant screen. This firmly established the wave theory of light, and this classic experiment has been used to prove the "weirdness" of quantum. Namely, if you repeat this experiment with only one photon at a time, you still build up the exact same interference pattern. The single photon goes through both slits and interferes with itself on the other side. Say whaaaaaat?
Physics with Professor Matt Anderson

[@kartikkaushik2652]

From India and your lectures are undoubtedly perfect for the "NEET" Undergraduate Medical Entrance examination. They cover literally all the concept that are/were asked in previous years!

[@fizixx]

This is a terrific problem. These can be so tangly to understand. I know they gave me fits, but now...it's just fascinating how much info one can obtain. 😎

[@yoprofmatt]

Thanks for this. Good stuff, physics. Cheers, Dr. A

[@AlpineHiker]

Not in this class but I really like this professors teaching style

[@yoprofmatt]

Glad to hear it. It's not for everyone. I get that. But I appreciate hearing from the ones who enjoy it. Cheers, Dr. A

[@manuboker1]

Excellent good vibes physics lectures!! Making it easy to comprehend.

[@afnDavid]

Excellent!

[@yoprofmatt]

Many thanks! Cheers, Dr. A

[@AB-et6nj]

Thank you!!!

[@yoprofmatt]

You're welcome. Cheers, Dr. A

[@christopherevansanders3629]

Ok the photon shot through the slits is observed what happens is the field used to observe the photon shot is at a 90° polarization so they cancel out no wave pattern and when you observe it twice your really observing the photon from second observance landing or leaving the wall creating the wave pattern so to prove this you take your observance and adjust it's polarity to the photon shot through the slits you should get more pattern the further away from 90° polarization you get thank you

[@yoprofmatt]

Thanks for joining the discussion. Cheers, Dr. A

[@Dr_LK]

Tan theta=ym/lambda, not sin theta, based on the triangle drawn! Of course for small angle approximations, since both of them are just theta, the calculation in this example is correct.

[@yoprofmatt]

Yes, thank you. And yes, we're using the small angle approximation where sinθ ~ tanθ ~θ (in radians). Cheers, Dr. A

[@tehallanaz]

In a universe of oscillations be an oscillation because that’s all you can do. The end.

[@yoprofmatt]

Love it. Print it on a shirt. Cheers, Dr. A

[@thethirdchimpanzee]

I know very little about math past algebra, but I am trying to learn...can someone tell me, for "d", is that like...do you use like centimeters or millimeters or something? I really want to know. When I see something like "F = ma" I get it but now I want to know how to use it. "F" is Newton's...? Or? And what unit do you put in for mass? What for acceleration!?

[@yoprofmatt]

Great question. Units are tricky. We use what's called SI units (International Standard of Units): Mass m = [kilograms] Distance d = [meters] Time t = [seconds] With these basics in mind, we get: Force F = ma = [kilogram*meter/second^2] = [Newtons] You might want to review my playlist for Module 1: kzbin.info/aero/PLMXAf0aPgIuUA_4jTkQD2-u3fNE38ZwXd Cheers, Dr. A

[@nucleardonuts7028]

12:04 Matt's students be like:🗿

[@firdausfirdaus4855]

Why the heck this is my recommendation

[@AB-et6nj]

Because you need to learn

[@firdausfirdaus4855]

@@AB-et6nj i am just senior high school student lol

[@AB-et6nj]

@@firdausfirdaus4855 No worries, just joking

[@yoprofmatt]

Welcome to my high school Fandersons™. This stuff will help you get through college. At least that's my hope. Also in college you'll need coffee. Lots of it. Cheers, Dr. A

[@firdausfirdaus4855]

@@yoprofmatt thanks mate ✍️

[@ghostpeyton]

Why was this recommended to me

[@yoprofmatt]

I'll reply (and I'm no algorithm): It was recommended to you because your entire future is based on understanding two-slit interference. Okay, maybe that's a bit of an exaggeration. But it's still pretty cool. Cheers, Dr. A

[@ghostpeyton]

Dear@@yoprofmatt while my understanding of 2 slit interfaces has undergone amplification, I believe the reason I under went the given lecture was based on previous and current viewing habits that range from physics to computer science lessons. Though given the information I have learned, if I see a video of your appear in my recommended, fear not as I will view it as to expand my horizons once more. A now quite philosophical student, ghostpeyton.

[@kondrahtiz7370]

is it experimentally prooved ot just by theory, that red is producing wider interference? Lambda relation.