A solid cube and a solid sphere of identical material and equal m… - Vidyadip

MCQ

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,

A
the cube will cool faster because of its sharp edges
✓
the cube will cool faster because it has a larger surface area
C
the sphere will cool faster because it is smooth
D
the sphere will cool faster because it has a larger surface area

✓

Answer

Correct option: B.

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

b
(b)

Area of cube is more than that of a sphere for same mass and density.

Cube also have sharp edges that radiates more effectively than a flat surface.

So, rate of cooling for cube is much rapid than sphere. Effect of sharp edges is prominent only at very high

temperatures. So, option $(b)$ is correct.

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