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Question
Assertion :A hollow metallic closed container maintained at a uniform temperature can act as a source of black body radiation. Reason: All metals act as black bodies.
Assertion :A hollow metallic closed container maintained at a uniform temperature can act as a source of black body radiation. Reason: All metals act as black bodies.
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Solution
The correct option is D Both Assertion and Reason are incorrect
A perfect black body is one which absorbs all heat radiations (whatever be the wavelength) incident on it. No natural object is perfect black body. Best approximations are lamp and platinum black. Fery's black body is a double walled metallic sphere coated with lamp black on the inside and nickel an outside. IT has a narrow opening opposite a conical projection inside
∴ Both assertion and reason are false.
A perfect black body is one which absorbs all heat radiations (whatever be the wavelength) incident on it. No natural object is perfect black body. Best approximations are lamp and platinum black. Fery's black body is a double walled metallic sphere coated with lamp black on the inside and nickel an outside. IT has a narrow opening opposite a conical projection inside
∴ Both assertion and reason are false.
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