NEET 2014 Physics Newton's Law of Cooling MCQ Question
Certain quantity of water cools from 70 °C to 60 °C in the first 5 minutes and to 54 °C in the next 5 minutes. The temperature of the surroundings is
45 °C
20 °C
42 °C
10 °C
Correct Answer
Detailed Explanation
Using Newton's law of cooling, the average temperature difference in the first interval is 65 °C and in the second interval is 57 °C. Solving the equations gives the surrounding temperature as 42 °C.
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