Assertion (A): Two metallic spheres of same size, one of copper and other of aluminium heated to the same temperatures, will cool at the same rate when they are suspended in the same enclosure.
Reason (R): The rate of cooling of a body is directly proportional to the excess of temperature of the body over the surroundings.

both A and R are true and the R is correct explanation of the A

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both A and R are true, but R is not correct explanation of the A

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A is true, but the R is false.

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A is false, but the R is true.

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Solution

The correct option is B both A and R are true and the R is correct explanation of the A
According to Newton's law of cooling: $\frac{d θ}{d t} = - k (θ - θ_{0})$
Cooling depends on temperature difference of body and surrounding.

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The correct option is B both A and R are true and the R is correct explanation of the AAccording to Newton's law of cooling: dθdt=−k(θ−θ0) Cooling depends on temperature difference of body and surrounding.

The correct option is B both A and R are true and the R is correct explanation of the A
According to Newton's law of cooling: $\frac{d θ}{d t} = - k (θ - θ_{0})$
Cooling depends on temperature difference of body and surrounding.