Assertion (A): For small temperature difference between body and surrounding, the rate of cooling directly proportional to the difference in temperature, known as Newton's law of cooling.
Reason (R): Newton's law of cooling is valid for heat transfer by radiation mode only.
(1) Both (A) & (R) are true and the (R) is the correct explanation of the (A)
(2) Both (A) & (R) are true but the (R) is not the correct explanation of the (A)
(3) (A) is true but (R) is false
(4) Both (A) and (R) are false
Solution:
Assertion (A) correctly states Newton's law of cooling. Reason (R) is false; Newton's law of cooling is primarily derived from convection, and it is a good approximation for small temperature differences involving conduction and convection, not exclusively radiation.
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