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JEE PHYSICS MCQ: THERMAL PROPERTIES OF MATTER

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Analyzing +4 | -1
Assertion: A sphere a cube and a thin circular plate made of same material and of stable mass are initially heated to 200∘C200^{\circ} \mathrm{C}, the plate will cool at fastest rate.
Reason: Rate of cooling =eAσms(T4−T04)∝=\frac{\mathrm{eA} \sigma}{\mathrm{ms}}\left(\mathrm{T}^4-\mathrm{T}_0^4\right) \propto surface area and surface area is maximum for plate.
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Correct option: A
If both Assertion & Reason are True & the Reason is a correct explanation of the Assertion
Option A is correct. The assertion is true because the rate of cooling depends on the surface area, and the plate has the largest surface area. The reason correctly explains why the assertion is true.

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