Three solid objects of the same material and of equal mass-a sphere, a cylinder (length = diameter) and a cube are at 500Â°C initially. These are dropped in a quenching bath containing a large volume of cooling oil each attaining the bath temperature eventually. The time required for 90% change in temperature is the smallest for

Three solid objects of the same material and of equal mass-a sphere, a

1.	Three solid objects of the same material and of equal mass-a sphere, a cylinder (length = diameter) and a cube are at 500Â°C initially. These are dropped in a quenching bath containing a large volume of cooling oil each attaining the bath temperature eventually. The time required for 90% change in temperature is the smallest for
A.	cube
B.	cylinder
C.	sphere
D.	equal for all the three
Answer» B. cylinder

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