Assertion (A): The radiation from the sun surface varies as the fourth power of its absolute temperature.
Reason (R): Sun is not a black body

Both A and R are true, R is correct explanation of A

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Both A and R are true, R is not correct explanation of A

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A is true but R is false

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Both A and R are false

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Solution

The correct option is B Both A and R are true, R is not correct explanation of A
According to Stefan's law, energy emitted is proportional to fourth power of absolute temperature.
So, the same will hold for the sun.
Also, Sun can absorb/emit radiations of all wavelengths - so it is a black body.
So, assertion and reason are both correct.
But reason is not a correct explanation of assertion.
Because all bodies emit energy which is proportional to fourth power of absolute temperature, not only sun.

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Assertion (A): The radiation from the sun surface varies as the fourth power of its absolute temperature.Reason (R): Sun is not a black body

Assertion (A): The radiation from the sun surface varies as the fourth power of its absolute temperature.
Reason (R): Sun is not a black body