First slide

Convection

Question

A bucket fulI of hot water is kept in a room and it cools from 75^oC to 70^o in T₁ minute, from 70^oC to 65^oC in T₂ minute and from 65"C to 60"C in T₃ minute; then

Easy

A

$T_{1} = T_{2} = T_{3}$
B

$T_{1} < T_{2} < T_{3}$
C

$T_{1} > T_{2} > T_{3}$
D

$T_{1} < T_{2} > T_{3}$

Solution

Rate of loss of heat is directly propotional to temperature difference between the body and its surroundings.
$T_{3} > T_{2} > T_{1}$

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