Which of the following is best close to an id | vedclass

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(D) An ideal black body is defined as a body that absorbs all incident radiation falling on it,regardless of the frequency or angle of incidence.$A$ c

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cavity maintained at constant temperature

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(D) An ideal black body is defined as a body that absorbs all incident radiation falling on it,regardless of the frequency or angle of incidence.$A$ cavity maintained at a constant temperature,often called a Fery's black body,is the closest physical approximation to an ideal black body.In this setup,any radiation entering the small hole of the cavity undergoes multiple internal reflections. At each reflection,a portion of the radiation is absorbed by the walls. After many such reflections,almost all of the incident radiation is absorbed,making it an excellent black body.

Which of the following is best close to an ideal black body?

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