Question

What is effect on temperature vs time graph when the temperature of enclosure is large in the experiment to plot the cooling curve for the relationship between the temperature of a hot body and time?

• A. Graph becomes more flattened
• B. Graph becomes a straight line
• C. Graph become more curved
• D. None of these

Answer 1

Answer: (A)

Graph becomes more flattened

By Newton's Law of cooling, we know that,

$\frac{dT}{dt}=k(T-T_{Surroundings})$

Now if $T_{Surroundings}$ is very large, then the slope of T-t graph, i.e. $\frac{dT}{dt}$ is very small, and hence the graph becomes more flattened.