A solid cube and a solid sphere of identical material and equal masses are heated to the same temperature and left to cool in the same surroundings. Then ;

the cube will cool faster because of its sharp edges.

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the cube will cool faster because it has a larger surface area.

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the sphere will cool faster because it is smooth.

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the sphere will cool faster because it has a larger surface area.

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Solution

The correct option is B the cube will cool faster because it has a larger surface area.
By stefan's law
rate of cooling $α$ surface area
As cube has more surface area than sphere, so it cools faster.

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A solid cube and a solid sphere of identical material and equal masses are heated to the same temperature and left to cool in the same surroundings. Then ;

The correct option is B the cube will cool faster because it has a larger surface area.By stefan's lawrate of cooling α surface areaAs cube has more surface area than sphere, so it cools faster.

The correct option is B the cube will cool faster because it has a larger surface area.
By stefan's law
rate of cooling $α$ surface area
As cube has more surface area than sphere, so it cools faster.