Particle Physics (29 of 41) What is a Photon? 13. Mie Scattering

In this video I will explain Mie scattering of photons scattering off large particles.

Next video in the Particle Physics series can be seen at:

[Ameen_AAA]

I'm still learning from your channel every now and then since 2014. Huge respect and thanks.

[julianjawadahmad]

You're one of the best educators on youtube.

[rainerdbeck]

f should be replaced by lambda in the cos(r/f) and exp(-kr/f)

[vkh]

In Mie Scattering formula, shouldn't it be "r/lambda", instead of "r/f". Because r/f is not dimensionless. And cosine of some dimensional argument doesn't make sense.

[lamsw]

This video is great!! And confusing, wish I wouldn’t have watched it first because Q from Mie Theory is typically extinction efficient not extinction coefficient (typically gamma). I was very confused until I could look up in a respected text book. This video is good but also a glossed over introduction so be-careful.

[heattransfer]

Hello sir. Where did you take these information? Like 1/10 lambda and all numbers? Is there any article?

[ahmo]

sir, i wanna ask you what can be the phase function (P(pi)) in rayleigh backscattering, in a micro wave area and the study particle is ammonium sulfate

[waelfadlallah]

Final question sir, that is bugging me a lot!
How does the sun produces the different wavelength of light/radiation, now i know the sun produces the EM waves through beta decay but the issue here doesn't that mean we should receive a single wavelength since it's a single process of beta decay (on a large scale) or is it that through this mechanism we get all the wavelengths possible which brings me to my last inquiry which is, do these radiation travels towards us as a single superimposed wave or as discrete waves each with its own frequency ?!!
I hope i didn't bother and also i send the right message.

[keppela]

You've got both radius over frequency and radius over wavelength on the board. Is that right, or should all the equations be radius over wavelength??

[鲨鱼辣椒-wx-yv]

Mr. Professor Mie Scattering of a single particle, is the scattered light distributed symmetrically around the incident light, that is, the scattered light is distributed exactly in a circle, do you agree with this point of view? This question has troubled me for a long time, I hope you can reply me, thank you！

[randyzhang]

Very helpful, thank you. I want to ask a question. What is the mean of "k" in Mie scattering?

[SuperAliez]

Gracias! Thank you! I understand much better the Mie Theory.

[serathilsss]

+Michel van Biezen
Thank you.
but are there any relation between mie scattering with concentration of the particle?

[hardikjoshi]

Hello sir,
In video 3:00 you said in Mie scattering most of photon scattered in forward direction, and in example of car headlight @7:25 you mentioned most light reflected back because of mie sacttering.. Both statement cnflicting...

[sabbadini]

Have you some articles about Mie Scattering and it's computation?

[kalyanibrahma]

hello. in the graph is it the ratio of r/lambda × 1/10 or is it that r/lambda= 1/10 and varies upto, r/lambda= 1

[bsht]

thank you so much, very nice lectures!

[joseiltonricardo]

Coloque legenda para português para que alcance mais pessoas.

[shubhamsrivastava]

u explained well sir,
for your next video
only suggestion to improve is: keep notice of lights on white board..things u wrote on white board is not visible clearly in videos...might be because of too much scattering....

[TheBigBanggggg]

For me a rather non-intuitive explanation: the bigger the object light is scattered off, the more light is scattered forward? My brain can't handle that.