First slide

Radiation

Question

It takes 10 minutes to cool a liquid from $61^{0} C to 59^{0} C$ . If room temperature is $30^{0} C then find the time taken in coolking from 51^{0} C to 49^{0} C$

Moderate

A

15 min
B

12 min
C

18 min
D

20 min

Solution

In first case $\frac{61 - 59}{10} = K [\frac{61 + 59}{2} - 30] - - - - - - (i)$
In second case $\frac{51 - 49}{t} = K [\frac{51 + 49}{2} - 30] - - - - - (ii)$
By solving t = 15 min.

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