Question

Hot water in a vessel kept in a room, cools from ${70}^{\circ }C$ to ${65}^{\circ }C$ in $t_1$ minutes, from ${65}^{\circ }C$ ot ${60}^{\circ }C$ in $t_2$ minutes and from ${60}^{0}C$ to ${55}^{0}C$ in $t_3$ minutes.
Then,

• A. $t_1<t_2>t_3$
• B. $t_1=t_2=t_3$
• C. $t_1>t_2>t_3$
• D. $t_1>t_2=t_3$
• E. $t_1<t_2<t_3$

Answer 1

The correct option is E $t_1<t_2<t_3$

Rate of fall proportional to excess of temperature over surrounding so, $t_1<t_2<t_3$.