🔴 Stefan-Boltzmann law || for Class 11 in HINDI

In this Physics video in Hindi we explained Stefan-Boltzmann law for blackbody radiation for class 11. Every body emits energy, which depends upon its surface area, temperature and emissivity. This law states that the energy emitted by a body per second is the product of the emissivity of that body, the Stefan-Boltzmann constant, the surface area of the body and the fourth power of the absolute temperature of that body.
🔴 Click here to watch the whole playlist on 'Thermal Properties of Matter' for Class 11 :
• Thermal Properties of ...
Previous videos -
🔴 Thermal Properties of Matter - Introduction || in HINDI for Class 11
• Thermal Properties of ...
🔴 Temperature and Heat
• 🔴 Temperature and Heat...
🔴 Measurement of Temperature || for Class 11 in HINDI
• 🔴 Measurement of Tempe...
🔴 Ideal Gas Equation and Absolute Temperature || for Class 11 in HINDI
• 🔴 Ideal Gas Equation a...
🔴 Kelvin Scale of Temperature
• 🔴 Kelvin Scale of Temp...
🔴 THERMAL EXPANSION
• Thermal Expansion || f...
🔴 Relation among Coefficients of Thermal Expansion
• Relation among Coeffic...
🔴 THERMAL STRESS || in HINDI
• THERMAL STRESS || in H...
🔴 Anomalous Thermal Expansion of Water
• 🔴 Anomalous Thermal Ex...
🔴 Coefficient of Volume Expansion of Gas
• 🔴 Coefficient of Volum...
🔴 Heat Transfer
• 🔴 Heat Transfer || for...
🔴 Conduction and Thermal Conductivity
• 🔴 Conduction and Therm...
🔴 Convection
• 🔴 Convection || for Cl...
🔴 Radiation || for Class 11 in HINDI
• 🔴 Radiation || for Cla...
🔴 Wien's Displacement Law for Blackbody Radiation
• 🔴 Wien's Displacement ...

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Very kind of you sir 💯

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Your explanation is superb.👌👌👌👌👌.
You just cleared all my doubts.😊

[@swastiksarkar3360]

6:43 how can body of T temperature absorb radiated heat from body of T' temperature? If T > T' . Or this temperature dependent heat transfer is only for conduction and convection , and not for radiation? Like any body can radiate which can be absorbed by any body irrespective of temperature.
But if T'> T, H becomes negative. So heat loss becomes heat gained. Right?

[@daddy_dazai_]

Heat transfer occurs always in both directions. Even two bodies at same temperature transfer heat in both directions but the rate of transfer is same for both of them, so temp remains constant

[@swastiksarkar3360]

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Very very very infinite kind of you sir 💯😊

[@jainamoza5051]

Great explation sir but i have a doubt Sir when surrounding temperature is greater that the body temperature for that how we deal

[@Sourja]

Then the main body radiates heat and transfers it to the environment outside. And the outside environment also radiates heat,which is got by the main body. This process goes on... according to prevost's theory

[@jainamoza5051]

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I enjoyed your video .Please make more videos.

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Sir please make a video on Boltzmann brain

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No one has described black body the way you have described
As I had listen many lectures

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[@helishmaharjan5552]

At 9:04 we considered there sigma. So does it means that we are considering the surrounding as black body because value of sigma is only valid for black body.

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[@manojkumarjena7492]

Sir, what is the difference between Stefan's constant and Stefan Boltzmann constant

[@faisaljamil3822]

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[@dipikaparmar2320]

Sir , what is the reason behind taking the fourth power of absolute temperature and not only T in this equation and one more question , what is the fourth power of kelvin and why the H is directly proportional to T^4 and not to T?

[@santoshsharma5974]

Because if there is T^4 change in temp.
There is unit change in H

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[@prajwalgyawali2519]

What is the emesivity of white colour surface

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Sir why is it -4, -8, -1.... Like this all in given formula

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Good

[@mukundadevbehera5871]

Sir i have a doubt
Why u take emmisivity of surrounding 1 in case of black body
And in case of ordinary body
The emmisivity of both system and surrounding is sigma
Why same ?
(My confusion is the emmisivity of system and surrounding may be different ) .

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[@prajwalgyawali2519]

It should be directly proportional to time

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why T power 4 sir?

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One thing you said is wrong!!!
Blackbody is not a good radiator

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