A solid copper sphere of radius $R$ and a hollow copper sphere of outer radius $R$ are heated to the same temperature and allowed to cool in the same surroundings. Then

Solid sphere cools faster

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Hollow sphere cools faster

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Both cool equally

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Cannot be decided

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Solution

The correct option is D Hollow sphere cools faster
When heated at the same temperature, both solid and hollow sphere emit the same power. But the hollow one has smaller heat capacity, so emitting the same power it cools faster.

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A solid copper sphere of radius R and a hollow copper sphere of outer radius R are heated to the same temperature and allowed to cool in the same surroundings. Then

The correct option is D Hollow sphere cools fasterWhen heated at the same temperature, both solid and hollow sphere emit the same power. But the hollow one has smaller heat capacity, so emitting the same power it cools faster.

A solid copper sphere of radius $R$ and a hollow copper sphere of outer radius $R$ are heated to the same temperature and allowed to cool in the same surroundings. Then

The correct option is D Hollow sphere cools faster
When heated at the same temperature, both solid and hollow sphere emit the same power. But the hollow one has smaller heat capacity, so emitting the same power it cools faster.