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Home  >>  JEEMAIN and AIPMT  >>  Physics  >>  Class11  >>  Thermodynamics
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The temperature of a solid falls from $\;77^{0}C\;$ to $\;73^{0}C\;$ in 3 minutes and $\;73^{0}C\;$ to $\;69^{0}C\;$ in 4 minutes . What is the room temperature ?

$(a)\;59\qquad(b)\;61\qquad(c)\;71\qquad(d)\;91$

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1 Answer

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Answer : 59
Explanation :
$\large\frac{dT}{dt} = K (\large\frac{\theta_{1}+\theta_{2}}{2} - \theta_{s})$
$\large\frac{\large\frac{4}{3}}{\large\frac{4}{4}} = \large\frac{K(75 - \theta)}{K (71 - \theta)} = 59^{0}C$
answered Apr 8, 2014 by yamini.v
 

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