Two balls of the same material and finish have diameters in the ratio 3 : 1. They are heated to the same temperature and cool by radiation. Find the ratio of the rate of cooling of the bigger to the smaller.
Options:
Answer:
B
Solution:
The rate of cooling $\propto \frac{1}{r}$ . The ratio is $\frac{1}{3} = 0.33$ . B.

Question

Two balls of the same material and finish have diameters in the ratio 3 : 1. They are heated to the same temperature and cool by radiation. Find the ratio of the rate of cooling of the bigger to the smaller.

Options:

Answer:

B

Solution:

The rate of cooling $\propto \frac{1}{r}$ . The ratio is $\frac{1}{3} = 0.33$ . B.

TestHub · Accepted Answer

The rate of cooling ∝ r 1 ​ . The ratio is 3 1 ​ = 0.33 . B.

Physics - Heat & Thermo Question with Solution | TestHub

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