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KCET2020PhysicsThermal Properties of Matter

A sphere, a cube and a thin circular plate all of same material and same mass initially heated to same high temperature are allowed to cool down under similar conditions. Then, the

Options

  1. Aplate will cool the fastest and cube the slowest
  2. Bsphere will cool the fastest and cube the slowest
  3. Cplate will cool the fastest and sphere the slowest
  4. Dcube will cool the fastest and plate the slowest

Correct answer

C. plate will cool the fastest and sphere the slowest

Step-by-step solution

The rate of heat transfer is directly proportional to the surface area of body. Since, circular plate has greatest surface area and sphere has least surface area amongst the given three bodies. Hence, when a sphere, a cube and a thin circular plate are allowed to cool down under similar conditions, then the plate will cool the fastest and sphere the slowest.

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