JEE Main 2022 Physics question
Read the following statements: A. When small temperature difference between a liquid and its surrounding is doubled, the rate of loss of heat of the liquid becomes twice. B. Two bodies P and Q having equal surface areas are maintained at temperature 10°C and 20°C. The thermal radiation emitted in a given time by P and Q are in the ratio 1 : 1.15. C. A carnot Engine working between 100 K and and 400 K has an efficiency of 75%. D. When small temperature difference between a liquid and its surrounding is quadrupled, the rate of loss of heat of the liquid becomes twice. Choose the correct answer from the options given below
Solution
By Newton's law of cooling the rate of loss of heat is proportional to the temperature difference, so A is correct and D is wrong. For radiation , so
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