Assertion :When a black body is thrown in a furnace, initially it is darkest and finally it is brightest. Reason: The emissivity as well as absorption power of block body is $1$ .

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Assertion is incorrect and Reason is correct

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
When we throw the block body in a furnace it will start absorbing the heat given by furnace but due to having same emmissivity and absorbtivity it will radiate too emmisivity of a black body is one.

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Assertion :When a black body is thrown in a furnace, initially it is darkest and finally it is brightest. Reason: The emissivity as well as absorption power of block body is 1.

Assertion :When a black body is thrown in a furnace, initially it is darkest and finally it is brightest. Reason: The emissivity as well as absorption power of block body is $1$ .