Stefan Boltzmann law and Emissivity | video in HINDI

In this Physics video lecture in Hindi on Radiation for class 11 we explained Stefan Boltzmann law of blackbody radiation. During the derivation of the equation for the rate of radiation for any surface we found that it is equal to the product of emissivity of the surface, the Stefan's constant, the surface area and the fourth power of the absolute temperature of the object. Further we defined emissivity of a material. It is the ratio of the rate of radiation emitted through a unit area of the material to the rate of radiation emitted through a unit area of a blackbody under same condition.
फिजिक्स के इस वीडियो में हमने Stefan Boltzmann के सिद्धांत पर बात किया है | यह सिद्धांत हमें यह बताता है कि किसी भी एक वस्तु का रेडिएशन का दर कितना होगा |आगे हम एक और मुद्दा जोकि है एमीसीविटी, उस पर भी बात किया है |
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I don't even speak Hindi, but feel like this video was more helpful than my lecture... thanks!

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Sir how deduction of Stefan boltzman law by emmisive power?please link of video.

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Do u know how to carry an experiment on this.

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Sir please do a video on Boltzmann transport equation and it's Drift component and Collision component........

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Sir at 4:31 it can also be valid only for any other perfectly absorbing surface or not

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sir emitter means transfer heat, but the value of e is one for black body, and we know that black body only absorb the heat and does not transfer then why it's emissive value is high??

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Do we have to study these things in class 11

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Sir it is true for total radiation or for monochromatic radiation

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At 8:50 sir why the areas of both the black body and general body will be cancelled as it is not necessarely to be equal.....

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It's necessary to be equal.

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Sir I have a question ,does black body only absorb all types of radiations or it also emits ? Waiting for a fast reply,thanks

[@edupoint.physics]

+Sunny Singh Good. Agar koi sirf absorb hi karega to usme stored energy badhte hi jayega. Hamesha ke liye kya ye possible hai? Khud vichaar karein.

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Will that help in jee

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I thought that aluminium is a metal so it would get hot faster cause its a good absorber and also will lose that heat soon caus its said that good absorber are also good emitters

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[@edupoint.physics]

+neeraj vijay Yes.

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