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Two hollow suphers of same material one ...

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

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The hollow spheres of different materials one with double the radius and one- fourth wall thickness of the other are filled with ice. If the time taken for complete melting of ice in the large radius one is 25 min and that for smaller one is 16 min , the ratio of thermal conductivities of materials of larger sphere to smaller sphere is

Two spheres of different materials one with double the radius and one-fourth wall thickness of the other are filled with ice. If the time taken for complete melting of ice in the larger sphere is 25 minutes and for smaller one is 16 minutes, the ratio of thermal conductivities of the materials of larger sphere to that of smaller sphere is:

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Two spheres of different materials one with double the radius and one-fourth wall thickness of the other, are filled with ice. If the time taken for complete melting ice in the large radius one is 25 minutes and that for smaller one is 16 minutes, the ratio of thermal conductivities of the materials of larger sphere to the smaller sphere is

There are two metallic spheres of same radii but one is solid and the other is hollow, then

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