Black body radiation

  • Thread starter Abhisuma
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  • #1
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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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  • #2
DrClaude
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Why should it?
 
  • #3
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Why should it?

I meant the whole system black body having a normal body inside it
 
  • #4
DrClaude
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Are you looking at the blackbody from the outside, or are you interested in the behavior of the grey body inside?
 
  • #5
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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
 
  • #6
DrClaude
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What do you think?
 
  • #7
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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
 
  • #8
DrClaude
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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?
 
  • #9
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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
DrClaude
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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
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