Two spheres of different materials one with double the radius and one-fourth wall…
Physics · NEET · NTA Exams — Properties of Solids and Liquids
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 that for smaller one is 16 minutes, the ratio of thermal conductivities of material of larger sphere to smaller sphere is
- 4 : 5
- 8 : 25
- 5 : 4
- 25 : 8
Answer
(D) 25 : 8
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