A hot liquid is kept in a big room. The logarithm of the numerical value of the temperature difference between the liquid and the room is plotted against time. The plot will be very nearly a/an___________________?
Correct answer: D. Straight line
- A. Ellipse
- B. Circular arc
- C. Parabola
- D. Straight line
Explanation
For a body cooling in a large surroundings at nearly constant temperature, Newton's law gives dT/dt proportional to the temperature difference. Integration makes ln of that difference vary linearly with time.
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