Black Body Radiation: Will it Behave as Perfect Black Body?

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Homework Help Overview

The discussion revolves around the behavior of a body with a given emissivity when placed inside a perfect black body, specifically questioning whether it will behave as a perfect black body itself. The context includes concepts of black body radiation and emissivity.

Discussion Character

  • Exploratory, Assumption checking, Conceptual clarification

Approaches and Questions Raised

  • Participants explore the implications of a normal body being placed inside a perfect black body and question the conditions under which it might behave like a perfect black body. There are inquiries about the perspective from which the black body is observed and the effects of coating a normal ball with lamp black.

Discussion Status

The discussion is ongoing, with participants raising questions about the definitions and behaviors of black bodies and grey bodies. Some guidance is offered regarding the definition of a black body and the implications of external observation, but no consensus has been reached.

Contextual Notes

Participants are considering the definitions of black bodies and the effects of coatings on normal bodies, with some confusion about the implications of these definitions in practical scenarios.

Abhisuma
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Will a body of given emissivity kept inside a perfect black body start behaving as a perfect black body?
 
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Why should it?
 
DrClaude said:
Why should it?

I meant the whole system black body having a normal body inside it
 
Are you looking at the blackbody from the outside, or are you interested in the behavior of the grey body inside?
 
DrClaude said:
Are you looking at the blackbody from the outside, or are you interested in the behavior of the grey body inside?
Can you please answer it for both
 
What do you think?
 
DrClaude said:
What do you think?
I am actually confused.The actual question that my teacher asked was that if I coat a normal ball with lamp black will it start behaving as a perfect black body
 
Abhisuma said:
I am actually confused.The actual question that my teacher asked was that if I coat a normal ball with lamp black will it start behaving as a perfect black body
Then go back to the definition of a black body, and think what happens if you look at the painted ball from the outside. Does it behave like a blackbody?
 
DrClaude said:
Then go back to the definition of a black body, and think what happens if you look at the painted ball from the outside. Does it behave like a blackbody?
A black body is the body that absorbs all radiations falling on it so when a electomagnetic radiation is directed towards the ball the lamp black will absorb it so the ball must behave like a black body.
Am I correct?
 
  • #10
Abhisuma said:
A black body is the body that absorbs all radiations falling on it so when a electomagnetic radiation is directed towards the ball the lamp black will absorb it so the ball must behave like a black body.
Am I correct?
Yes.
 
  • #11
DrClaude said:
Yes.
Thanks a lot!
 

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