Wien's Displacement Law - A Level Physics

The temperature of an object is inversely proportional to the peak wavelength. This is known as Wien's law, which is applicable to objects that can be approximated as black bodies, such as stars. Our sun has a temperature of 5800 K, which means its peak wavelength should be green! But our eyes prevent us from viewing the sun as a green star!
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[@douglasstrother6584]

Planck's approach was to analyze the entropy of blackbody radiation as a function of energy. To make both high-frequency and low-frequency data consistent with the Second Law of Thermodynamics, he included an additional "guess" term proportional to the frequency. Planck's application of Boltzmann's Statistical Mechanics led to his conclusion that the material of the walls emit and absorb radiation in discrete quanta. A paper titled "Planck’s Route to the Black Body Radiation Formula and Quantization" by Michael Fowler (7/25/08) gives a nice discussion.

[@imfoive3734]

Great explanation and the animation was so cool!!!! P.s. the green light sun concept kinda blowed me off!! Thank you so much for this amazing video!

[@KingTubeAR]

thank god our eyes can't see the sun green the sky would look depressing as fuck

[@artisticnoob5003]

OMG you are so underrated!! Thank you sm❤ this was really helpful

[@sevanthishekar4379]

Can anyone explain this any better?? Definitely not! It was perfectly explained. Thank You :)

[@hosoiarchives4858]

I can explain it way better

[@ohm7163]

S

[@carlosraya6881]

Helped a lot, thank you so much!

[@user-hb8xf3et4o]

Simple and crystal Clear.. cheers

[@msmventures799]

Thank yoooooouuuuuuu I finally understood it!! Well explained 💗

[@prathameshprafulhole2662]

This was literally the best explanation! Thankyou so much!

[@hoppybutter1875]

dammmnnn youre underappreciated amazing!

[@humasluni-itchan1366]

Woaah ! What an explination , Love it

[@shifarahim5456]

best explanation out of all and in th shoertest time !! Good work

[@aaronramirez493]

This video helped me so much! sending this to my classmates.

[@vipra7280]

Very helpful,understood the concept.

[@saumyaraj3689]

So quick and brief

[@saadhv6597]

Wonderful work.... Thanks a ton♥️

[@kamzzaa7265]

Wow what an explanation!! :)

[@wern531]

Thank you for the explanation.

[@JoyinQuark]

Brief and clear... Thanku so much ma'am.

[@houmantaherian7502]

it was great , I have biophysics exam , it helped me understand the whole material , thank you so much !!!

[@sumeraidrees9014]

Thank god I came across this....very well explained 😍🥰

[@ryneshaking8988]

Really beautiful explanation!!!! Thanks to you I'm a little more confident for my exam.

[@vt.physics]

good luck on your exam!

[@aesthetepisces5206]

loved the explanation .. thanks 😊

[@devanshtiwari2764]

Finally, I got it😌

[@ayushchoubey635]

Nicely explained , thanks

[@MohdHamzaKhan-fq6th]

Such a wonderfull explanation!! Thank you so much mam.

[@nadiya9851]

Wow crisp explanation...

[@unknown-sp8mv]

Cool explaination 👍

[@chiragpradhan3581]

Absolutely Brilliant ✨

[@vt.physics]

thank you!

[@aboobakarmohammed1242]

Tysmmmmm! I couldn't understand this with my tb

[@aamirkhan3838]

Very excellent explained 😃

[@harivigneshumasankar3050]

Really good explanation 👍👍

[@kaushikraj7155]

Excellent explanation

[@taghy91]

great explanation thanks al lot.

[@yogita9448]

🔥🔥🔥 It was awesome broo......keep it up❤️ 🔥🔥🔥

[@rebelyt203]

Bro😂🤦

[@RithvikGM]

Amazing explanation ❤

[@vishakhamahajan4601]

Great explanation....

[@joskokvesic7138]

Thank you

[@ayushmaan2657]

This was soo helpful

[@MohammedAli-xr6fb]

Tomorrow is my exam and this helped a lot in short time.. Big up

[@redvenom8822]

Good video :)

[@yimenici]

Thank you very much for this beautiful and clear explanation.. I kindly want to ask about that mathematical process, when I calculate it i found the result as 4.99 x 10^-7

[@patrickhorton4596]

great info... except the bit about flame colors at the beginning - that's just photo-emission in the plasma of the flame. Natural gas burns below 1700K and that is nowhere near the temperature needed to peak in the blue end of the blackbody spectrum.

[@RC08197]

Wow

[@anvayaiyer5614]

Lit! Fire! Dank! 🔥🔥🔥 Actually lemme just change the colour of that fire to blue...mmm... No emoji to match but you get the point... Teehee!!!

[@vt.physics]

😂 we can blueshift the flames!

[@anvayaiyer5614]

@@vt.physics lol! Clever! 😂

[@quickease1374]

Thanks

[@challengepoker]

The eye's peak intensity is yellow because the blue component of the sun is diffused by compton effect on ozone molecules high in the atmosphere (giving the sky its blue color) and the sun thus appears yellow and not white.

[@shahmeeralam1500]

Thnkks

[@AyuDarshan]

Dude u make awesome content why don't u have the ruby play button u make concpets seem simple using just the iPad and ipencil bravo 🤗🤗🤗😊😊

[@vt.physics]

Thanks dude for your support! Glad you like my vids. Play Button seems like a long way... but I'm working at it!

[@charlesbrightman4237]

Consider the following: "IF" temperature dictates whether a star is red or blue shifted, then how could 'red shift observations of stars' ONLY be concluded as 'space' itself is expanding? And what exactly is 'space' that it can expand?

[@greg5992]

Nice

[@satishmhatre2943]

Such a great video!! Also what could be the explanation behind the yellowish tint we always see of the sun 3:23 ?

[@vt.physics]

A star emits a range of wavelengths in its spectrum but it peaks at one particular wavelength. So a star might appear more yellow if the peak intensity is in the yellow visible light region.

[@satishmhatre2943]

@@vt.physics but doesn't it peak near the green region?

[@vt.physics]

@@satishmhatre2943 yep, you're right. It peaks around the green region, so it emits the most green light. But if you watch the end of the video, it explains how our eyes favour certain colours. And another factor that comes into play is the earth's atmosphere/climate. The amount of scattering differs depending on the wavelength. The atmosphere tends to scatter blue light more. So... White light (combination of all visible lights) minus blue light gives predominantly yellow.

[@angelinmary9291]

I finally got it !!!.Thanksss also are you an astrophysicist?

[@vt.physics]

my degree was in pure physics but studied a few astro modules at university

[@Iamdafish]

Dude my phy teacher cant explain it this well.

[@lekhatishbedse2275]

Perfection on its peak , for a particular video ...VT physics law 🥲♥️

[@werallgnnadieintheend]

Did you just say that the sun was green?!

[@erfanfekri7156]

I call this Yummy physics 😋, thanks for your great way of explanation 👍

[@utsav8786]

i call ur mom yummy too

[@ternak001]

How hot is the sun? Yellow

[@NeelamSingh.991]

What software is this???

[@DaReelGamerz]

Metres Kelvin is a very unusual unit. I keep seeing it as milliKelvin🤣

[@yuki002x]

what is the wavelength of bluelight??????

[@kansuerdem2799]

Dear Professor, Max Planck constant is the smallest unit in nature. how can it be that h/2pi is even be smaller?

[@vt.physics]

Planck's constant is, indeed, the smallest constant used in physics, which is reflective of the quantum scale. However, it is just a scale and not a physical quantity. Hope that clarifies it.

[@kansuerdem2799]

it's a a beautiful explanation. thank you Professor.

[@redsalt69]

Mam but if colours shifts towards left when temperature is increased . Then why is the rod appearing red when heated , it must be appearing in some other colour like blue or indigo because of high temps ?

[@vt.physics]

You're completely correct. When the rod is heated to a higher temperature, it will appear more blue. There's also the saying that something glows white-hot when it radiates the entire visible light spectrum.

[@redsalt69]

@@vt.physics but mam if an iron rod is heated to high temperatures and turns white in colour, why does such a big radiating structure like the appear to be green in colour? Is there any other factor affecting the max wavelength apart from temperature?

[@patrickhorton4596]

@@redsalt69 peak wavelength isn't quite the same thing as the color we see. What we see is a combination of the wavelengths of light being emitted (or reflected) by an object AND how our human eyes work. The "cones" in our eyes are not sensitive to all wavelengths of light, so something putting out a lot of light in a wavelength we can't see may not appear to glow at all (for example, infrared or ultraviolet).

[@adben]

Uv catastrophe explanation

[@tychophotiou6962]

I like your videos but cant get past the 10 second mark because of the horrible background noise. Can you please tell me if you have made any videos where your annoying noisey neighbour is not playing his music while you are talking?

[@hosoiarchives4858]

How do you define intensity

[@vt.physics]

Power per unit area

[@hosoiarchives4858]

@@vt.physics what does that mean in layman’s terms

[@vt.physics]

@@hosoiarchives4858 you can think of it as the amount of energy that lands on a certain area within an amount of time

[@stuartdann7523]

Notification Squad!!

[@fadhlinanoer6011]

Plaase turn on your CC please 🙏😌😌

[@vt.physics]

for some reason youtube removed auto CC for this vid. Thanks to you I've just realised it! I've manually added subtitles to it!

[@joerussell9929]

Hi

[@stuartdann7523]

First!

[@Gretchaninov]

At 2:06, you misspelled Wien as Wein. Unsubscribed.