Question
Question: A sphere, a cube and a thin circular plate, all of same material and same mass are initially heated ...
A sphere, a cube and a thin circular plate, all of same material and same mass are initially heated to same high temperature, then
A
Plate will cool fastest and cube the slowest
B
Sphere will cool fastest and cube the slowest
C
Plate will cool fastest and sphere the slowest.
D
Cube will cool fastest and plate the slowest.
Answer
Plate will cool fastest and sphere the slowest.
Explanation
Solution
Rate of loss of heat from a body is directly proportional to the surface area of the body. For a given mass of a material, the surface area of a circular plate is maximum while of sphere is minimum. Hence, the plate will cool fastest and sphere the slowest.