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Q.

Two spheres A and B have diameters in the ratio 1 : 2, densities in the ratio 2 : 1 and specific heats in the ratio 1 : 3; find the ratio of their thermal capacities

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a

1 : 6

b

1 : 12

c

1 : 3

d

1 : 4

answer is B.

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Detailed Solution

mACAmBCB=(4/3)πrA3ρACA(4/3)πrB3ρBCB=rArB3ρACAρBCB=1232113=112.
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