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Abhisuma
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Will a body of given emissivity kept inside a perfect black body start behaving as a perfect black body?
DrClaude said:Why should it?
Can you please answer it for bothDrClaude said:Are you looking at the blackbody from the outside, or are you interested in the behavior of the grey body inside?
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 bodyDrClaude said:What do you think?
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?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
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.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?
Yes.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?
Thanks a lot!DrClaude said:Yes.
Black body radiation refers to the electromagnetic radiation emitted from a black body, which is an idealized object that absorbs and emits all radiation that falls on it. It is a fundamental concept in thermal physics and plays a crucial role in understanding the behavior of objects at high temperatures.
A perfect black body is an object that absorbs all radiation that falls on it, without reflecting or transmitting any of it. This means that it also emits radiation at all wavelengths and temperatures, making it a perfect emitter. In other words, a black body behaves as a perfect black body by absorbing and emitting radiation at all wavelengths and temperatures.
No, not every object behaves as a perfect black body. In fact, most objects are not perfect emitters and absorbers of radiation. Real-world objects reflect, transmit, and absorb different amounts of radiation depending on their material and surface properties. However, certain objects, such as stars and planets, can be approximated as black bodies due to their high temperatures and the nature of their radiation.
Black body radiation is crucial in science because it helps us understand the behavior of objects at high temperatures, such as stars and planets. It also plays a significant role in fields such as thermodynamics, astrophysics, and quantum mechanics. Additionally, black body radiation is used in many practical applications, including infrared cameras and thermal imaging devices.
No, it is not possible to achieve perfect black body behavior in real-world objects. This is because perfect black body behavior requires an object to both absorb and emit radiation at all wavelengths and temperatures, which is not possible in reality. However, scientists can use techniques such as coating an object with a material that absorbs all radiation to approximate perfect black body behavior.