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JEE PHYSICS MCQ: THERMAL PROPERTIES OF MATTER

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A body temperature is change 90∘C90^{\circ} \mathrm{C} to 60∘C60^{\circ} \mathrm{C} in 5 minutes then find out the taken time when its is change 60∘C60^{\circ} \mathrm{C} to 30∘C30^{\circ} \mathrm{C} when temperature of surrounding is 20∘C20^{\circ} \mathrm{C}.
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Correct option: B
t=11min⁡t=11 \min
Option B (t=11min⁡t=11 \min) is correct because it is the time calculated using Newton's law of cooling with the given temperature changes and surrounding temperature.

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