(C) hollow metallic container with a small hole acts as a black body because any radiation entering the hole undergoes multiple reflections inside and

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If the $Assertion$ is correct but $Reason$ is incorrect.

(C) hollow metallic container with a small hole acts as a black body because any radiation entering the hole undergoes multiple reflections inside and is eventually absorbed. This is known as $Fery's$ black body. Thus,the $Assertion$ is correct.However,the $Reason$ states that all metals act as black bodies,which is false. Metals are generally good reflectors and poor absorbers of radiation. Therefore,the $Reason$ is incorrect.$\therefore$ The correct option is $C$.

Class 11 Physics 10-2.Heat Transfer Radiation (General, Kirchoff's law, Black body, Prevost's Theory)

Easy

$Assertion :$ $A$ 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.

AIIMS 2007 All AIIMS

A
If both $Assertion$ and $Reason$ are correct and the $Reason$ is a correct explanation of the $Assertion$.
B
If both $Assertion$ and $Reason$ are correct but $Reason$ is not a correct explanation of the $Assertion$.
C
If the $Assertion$ is correct but $Reason$ is incorrect.
D
If both the $Assertion$ and $Reason$ are incorrect.