Question

Four spheres A, B, C and D are of same radius
but made of different metals. Their densities are
in ratio 6 : 3: 4:5 and specific heats are in
ratio 2:5:4:6. These are initially kept at the
same temperature and placed in the same
surroundings. The sphere which has the
slowest rate of cooling is :-
(1) C (2) B (3) D (4) A
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Answer 1

answer should be 4 mean option A