Thermal Properties Of Matter 06 | Heat Transfer : RADIATION : Black Body and Krichoff's Law JEE/NEET 

Live Classes, Video Lectures, Test Series, Lecturewise notes, topicwise DPP, dynamic Exercise and much more on Physicswallah App. Download the App from Google Playstore ( bit.ly/2SHIPW6 ) Physicswallah Instagram Handle : instagram.com/physicswallah/ Physicswallah Facebook Page: facebook.com/physicswallah Physicswallah Twitter Account : twitter.com/PhysicswallahAP?s=20 Physicswallah App on Google Play Store : bit.ly/2SHIPW6 Physicswallah Website: physicswallahalakhpandey.com/ LAKSHYA Batch(2020-21) Join the Batch on Physicswallah App bit.ly/2SHIPW6 Registration Open!!!! What will you get in the Lakshya Batch? 1) Complete Class 12th + JEE Mains/ NEET syllabus - Targeting 95% in Board Exams and Selection in JEE MAINS / NEET with a Strong Score under Direct Guidance of Alakh Pandey. 2)Live Classes and recorded Video Lectures (New, different from those on RU-vid) 3)PDF Notes of each class. 4)DPP: Daily Practice Problems with each class having 10 questions based on the class of JEE Mains/NEET level. 5)Syllabus Completion by end of January, 2021 with topicwise discussion of Last 10 Years Problems in Boards, JEE Mains/NEET within Lecture. 6)The Complete Course (Video Lectures, PDF Notes, any other Study Material) will be accessible to all the students untill JEE Mains & NEET 2021 (nearly May 2021) 7)In case you missed a live class, you can see its recording. 8)You can view the videos any number of times. 9)Each chapter will be discussed in detail with all concepts and numericals 10)Chapterwise Approach towards JEE Mains/ NEET & Board Exams. ****Test Series for XI & XII**** We provide you the best test series for Class XI,XII, JEE, NEET chapterwise, which will be scheduled for whole year. The test series follows very logical sequence of Basic to Advance questions.& Evaluation of Test and Solution to all the questions at the end of the test. 11 Physics chapter 11 || Thermal Properties Of Matter 01 || Heat and Temperature |Temperature Scales ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-zpOK4wjC4h4.html Thermal Properties Of Matter 02 || Thermal Expansion -All Concepts for JEE MAINS/ NEET ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-9pKXcLkIMUw.html Thermal Properties Of Matter 03 || Calorimetry - Compilation of Old Videos || ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-T7Rp1ljKvmY.html Thermal Properties Of Matter 04 || Heat Transfer : Conduction part 1 | Heat Transfer JEE MAINS /NEET ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-auwtdtriyTs.html Thermal Properties Of Matter 05 | Heat Transfer : Conduction part 2 Equivalent Thermal Conductivity ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-WIWA-BYf9JY.html Thermal Properties Of Matter 06 | Heat Transfer : RADIATION : Black Body and Krichoff's Law JEE/NEET ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-e81poLpIzHA.html Thermal Properties Of Matter 07 | Heat Transfer : Radiation 02 | Wiens Law n Stefan's- Boltzmann Law ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-9FnyDK9xQjE.html Thermal Properties Of Matter 08 | Radiation 03 | Newtons Law Of Cooling JEE MAINS/NEET ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-Jdx2LJDRcJ4.html

32:06....God the way he said sorry❤..... There was a teacher in our coaching..his phone used to rang in the classroom atleast 20 times nearly everyday... But he never put it on silent mode... Neither receiving nor rejecting... It was so disturbing.... Whole class wanted to throw his phone out of the window... But god we were helpless🙄🥴🥴 And this man is teaching free... Still with such a dedication... Hats off... There can't be another alakh pandey in whole universe... ❤... More power to you sir

""Physicswallah is directly proportional to feel of physics"" where ""chuha khana band kar do ""remains constant.😂😂😂

Sir, I recommend your videos to all my friends.

41:05 I'm watching this in 12th and when he says "Kirchhoff's law" I'm like "abey yeh phir se aa gaya"

Radiation - 1:25 Theory of Exchange - 4:35 Emissive Power - 11:44 Absorptive Power - 17:47 Black Body - 24:08 Secondary Black Body Definition - 36:15 Black Body examples - 43:11 Kirchhoff's Law - 46:53 Proof of Thought Experiment - 50:20 JEE 2003 Qn - 59:00

Best teacher in RU-vid history physics wallah - alakh pandey

Timestamps Radiation - 1:25 Theory of Exchange - 4:35 Emissive Power - 11:44 Absorptive Power - 17:47 Black Body - 24:08 Secondary Black Body Definition - 36:15 Black Body examples - 43:11 Kirchhoff's Law - 46:53 Proof of Thought Experiment - 50:20 JEE 2003 Qn - 59:00

Batch pe enroll hone ke bad bhi , Alakh sir is best for fell the Physics.

Watched this lecture twice for the FEEL OF PHYSICS and teachers dont even bother to teach these topics , shows our exam oriented education system Best lecture ever found on internet on heat radiation 👍👍👍👍🙏🙏

49:14 Red wall good reflector h red colour ki i.e. bad absorber of red i.e. bad emitter of red

I felt confident when I discovered I knew half of this already.. Black bodies etc., and when Sir discussed red-shifting and blue-shifting, I got super-excited! Astronomy really fascinates me!

So in life try to become an emitter rather than a reflector

Kaun kaun chaheta hai ki sir ke 5 M subscriber jaldi se ho jaye

Better than any coaching . At least mine.

It's been more than 3 years since this video is uploaded but I'm still watching! It's really helpful, a student can study without any coaching by only physics wallah channel for his/her jee exam. Sir is really an amazing teacher, I'm a student of aakash inst but i study more here than in my coaching cuz I've missed so many classes of my coaching and I always try to watch the videos of sir before my physics/chemistry classes so that I can connect so much easily and then I perform better. Thankyou sir! :)

42:58 Astronomy 😍🥺Thanks sir. I love astronomy

Sir you are a gift of GOD ❤️❤️❤️

Wow the only educator of jee and neet with 4.13 million subscribers hats off 👏 🙌 👌

31:58 best thing about this great man is his humbleness even after his popularity and love from everyone

The thing what admired to me of your's sir, that still after beautiful and rich content, you stick to reality..imean confessed the content of jee mains and neet, even other's at short description of topics, considered themselves to the prepration of jee mains/advance..even that's not comparable from class 11 purpose..But at end one thing want to say, thanks alot from core of heart😄

" bb ka mtlv bb ki wines nhi "..nailed it. ..! 😂

40:42 Got the topic fully, your videos are very helpful and superior ♥️ no matter what the quality of video is teaching skill is important that you have very well

i am not Indian but still got a lot of help...Love from bangladesh

I was thinking... That why sir.. 34:08 ...Saying black sweeter, green... 😁😀 then i stop video and... Consentrate on sweeter.. Then i came to know that its.. Dark green.. 😝😂😂

Best ever lecture for Black body concept that can be found in youtube............... Alakh sir se acha yeh concept ko koi bhi nahi pada sakthe hai........ Colour of black body pe is se jyada explaination kahi pe bhi nahi milega

Har din 5k+ subscription bar rahe hain...Waaah Sirji..😇😎😎😎😍

37:20 totally unexpected 😂

Finally I got the concept of black body. I have searched about colour of black body even Google can't clear my concept but alakh sir did it.Sir you deserve BHARAT RATNA I think if you are not in youtube then maybe I never understand the concept of black body

48:42 Sir apne kaha ki, peeche ki laal body laal rang ki sabse achi absorber hai. Lekin sir wo to laal rang reflect kar rahi hai. Usne baaki colours absorb kiye kyuki unn colours ke liye uski absorbtive power jyada thi.. aur wo colours absorb ho gaye isiliye reflect nai ho rahe. Sir aapne 22:50 - 23:19 me yahi baat kahi hai. Please clarify, ki sahi kya hai.

48:50 sir aap opposite bol rhe hai.... Wall red colour ko sabse Kam absorb krega toh jab usko heat krenge toh sabse Kam red colour ke radiations niklenge

30:18 sir singing nerolac nerolac Watch at normal speed sir is even dancing

Such a beautiful phenomenon, man that's so cool!?!?!?😯😯😯😯

You deserve best physic teacher in india .who is watching during lockdown

More than 99% of the students don't share the video to their friends 😂

very few teachers I appreciate and you are one of those 2 ~-words from your admirer

Congratulations PW 8 million family Lots of love from Nepal 🇳🇵💗❤️❤️

Who else thought that Sir is wearing a black Sweatshirt before he told that he's actually wearing a green one 😂? 👇Do mention....

THIS IS THE MINDBLOWING, WANDERFUL ,INTERSTING ,UNBELIVIABLE VIDEO

OLD IS GOLD ✨

Very conceptual video bade bhai

Only one best teacher Jo hama re syllabus and concepts clear krta hai best teacher 👍👍

Sir I don't have words to praise ur teaching style. I just like it. Thanks sir for clearing my concept.

sir you told that a colour appears when it absorbed all visible colours except that particular colour that appears to us in 22:31 but now in 48:32 u r saying that the red wall is absorbing more red colour so it is ren in colour

Amazing thanku so much sir......

Ma sha Allah....sir aap bht zyada accha parhaate h...❤️❤️

Sir according to kirchhoff law agar red absorber he to woh red hi emit karegi par apne ye bataya tha ki agar silver wire ko hum heat karenge to woh red ho jayegi

35:07 loved that laughter💝😘

Sir aap hi ke wajah se mann hota hai physics padhne kaa...Love u sir😊😊

Sir is the emmiter of feel of physics and we are the absorptance of physics and some i am the reflectance of physics

Great physics wallah sir

SIR I WANT TO INVITE U TO MY SCHOOL FOR MOTIVATING STUDENTS AND MAKING THEM FEEL PHYSICS

I rarely watch Indian science channels, but I'm glad I found yours. Just love how much you enjoy science and how clearly you explain it.

sir ji, aap kitna accha padhate ho. maza aa jata hai. saare doubts jo the crystal clear ho jate hai. aur concept bohot strong ho jata hai. thank you.

Sir I have a question . Btw I am a big fan of yours , I'm studying bsc physics and still I regularly watch your video , to clear my concept . In this video at 23:23 you are saying that , the wall looks red cause , its absorptive power for red light is less and for other lights are high , that is why it is reflecting red and we are seeing the wall red . But in this video at 48:36 you are saying that according to Kirchoff's law emissive power is proportional to absorptive power and for the red wall absorptive power is high for red light and emissive power is also high for red light , that is why we are seeing the wall red . Both the statements contradict each other . Could you please take out some of your valuable time and explain what is actually happening to this wall ? Love you sir .

Best teacher, guide, friend and motivator available on youtube... love you sir... Remain happy always..

Main nhi hu akela ab IIT crack karna nhi mushkil kyonki mere sath hai physics wallah alakh sir u r great for econemy poor students lage raho God bless u

Sir u r the saviour 🥺 .. jha coaching m kuch bhi padha deta h sb ... u r the one who saves our future by providing this conceptual knowledge ... thankyouuuuuu😭

these videos will never get old

Sabko pta hai vaise likhne ki jarurat nhi the best teacher in our India for physics fell

35:08 vry cute 😁

seriously sir your teaching technique is so amazing

Sir kya feel diye ho sir! Thank you.. a 2023 aspirant!

I have a doubt sir you said that it is not necessary that black body always should be black in colour... Let's consider that it is red in colour it means it absorbed all colour expect red 🔴 am I write or not??? It means it did not absorb red colour so it is not perfect absorber how can it be a black body when it does not absorb all radiation?????????? This question is for all students Let's discussed about it in comment 💬 👇🏻👇🏻👇🏻👇🏻👇🏻🤔🤔🤔🤔🤔

in an isothermal closure, is it really necessary to polish the inside as black? i mean now the radiation is not escaping so the colour should not matter right? although i agree that it might be because black absorbs the most radiation.

sir aapka telegram channel ni h kya ??? you r a very good teacher 👍

outstanding lecture.......Thank u sir for ur support.......😊

Sir please make a video on graph questions I face problems in graph questions in general What should i do

How sir black body emits light it only absorbs light. If it emits light then why we don't go further research.

Ohhh..... Is there anyone like me who is studying this topic and approximately all syllabus of physics from God of physics..... 🥰🥰..... By the way happy new year all of you.............. It's 1 jan 2021 when I am writing this comment 😅😅😂😂

Best physics teacher of India 🙏🙏🙏

37:22 No Way Sir Know BB Ki Vines

Sir plz notice this Comment for everyone otherwise isme sabka ghata aur sabka jata. Or else friends plz clear this doubt. At near 48:30 you said red colour wall behind you absorbs more red so when it is heated it will emit more red than other colour BUT... actually it is reflecting red colour and absorbing other colours so other colours are invisible and red is visible to eyes and therefore other colours must be emitted when heated. Sir ji, ye genuine doubt he. Clear nahi hua to feel nahi aayega. Plz Do one favour and reply for clearance.

One of the best lecture of physics. 👌👌

Bahut ache se samajh mai aa tha hai sir... thnk u so much

the construction show at nearly 46:30 is actually called as "ferry's black body"

We can see black body's colour ,not because of reflection but because of emission from surface of that body. Yeh wala concept achha laga sir..

Sir hum up valle.bhut lucky h kyuki aap jesa ek diamond humare up mae hae ..... Really feeling happy to say that we r from up ......

48:41 did anyone else notice this? agar red dikh rahi hai cheez to sir ne spectral absorptive power batate hue kaha tha ki red ke liye a bohot kam hoga islie absorb hone ki jagah red reflect ho raha hai but yaha sir ne iska bikul ulta bola

Sir at 45:40 you explained that rays cannot go out again because of angle of incidence and reflection but if it is painted black it would be a good emitter but bad reflector of heat. Then how can the light not go out?

How can a topic be complex if Alakh sir is teaching it ...🙂🙂

Sounds quality is very well sir

If "hello bacho" at the beginning & "padhai karte rahe all the very best" at the end remains constant then alakh sir is directly proportional to the clearity of concepts.

The best RU-vid tutor🥺🥺🥺🥺🥰🥰🥰

Topers ko koi bhi padha sakta hai par teacher whi hota hai jo ek failer ko bhi toper bna sake sir 12th mai mere 55 marks thhe physics mai but now i feel physics and i esay se exams mai achhe marks he nhi balki physics se love sa ho rha hai mujhe

Sir aapne concept ko ekdam halwa bana diya.....BEST LECTURE ....sab kuch samaj aaya

You are great sir 👌👌👌

Sir I have a doubt? Black be too eak colour hota hai uske be koi wavelength hoti hai or agar eak black body sabhi colour ko absorb kr lati hai means hahari eyes tak kesi colour ke wavelength nahi pahuti to hamko vo dekhi he nahi deni chahya means it shoud be invisible. Any one who know about my doubt please reply me.

45:00 sir u said black body has 0 reflection.. Then how can it reflect as u show?

U are a peach for all of us sir

Best scene 27:27..... I saw it 5 times repeatedly 😂😂😂🤣🤣eeeeee dhoom..😂😂🤣😃Best Sir, HE MAKES LECTURES REALLY INTERESTING.. HIT LIKE👇👍 WHO TOO SAW THIS SCENE REPEATEDLY

Sir mene aaj ka lecture school 🎒📚 se chutti lekar complete kar liya 👍 Aur dopahar ko ek aur lecture dekh lunga and raat ko last lecture dekh lunga fir mera aaj aye chapter complete ho jayega. 🙏

Black is not a colour but black is my favourite colour 😏😏

You tube par pehli bar mujhe sacchi bat sikhne ko mili h wo bhi free me thank you sir you made up my concept in physics and prepare for iit jee

Alakh sir is literally our real life Jeetu Bhaiya. Physics ki feel aa jaati h sir ki wajah.

Sir chuhe khane ka Kya mtlb Hota h

Sir where is ur black glove. Without black glove 😯

No one can replace these lectures..

23:49-red ke liye absorbtive power bahut kam.......49:00-red ke liye absorbtive power bahut jada so red ke liye emmisive power jada

@Physicswallah sir aap me wo kuch toh baat hai jo alag hai jo learning ko ek alag hi meaning mehasus karvati hai...love alakh sir...you are best of the best teacher of all time !