Newton’s Law of Cooling – Rankers Physics

Newtons Law of Cooling: Practice Problem & Solution

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

Short Solution (Best for NEET):

To solve this problem, we apply the core principles of Newtons Law of Cooling. Understanding the underlying formula is key to arriving at the correct answer below:

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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