Two hollow spheres of same material one with double the radius of the other and double the thickness of the other filled with ice. The ratio of times in which ice gets melted in the two spheres is:

2 : 1

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1 : 2

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4 : 1

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1 : 4

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Solution

The correct option is C $4 : 1$
Sphere 1 has 8 times the ice. The heat transfer is also 2 times due to 4 times area and 2 times thickness.
Hence, the time will be 4 times than that of second one.

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