Explain why (a) Two bodies at different temperatures T1 and T2 if brought in thermal contact do not necessarily settle to the mean temperature (T1 + T2)/2. (b) The coolant in a chemical or a nuclear plant (i.e., the liquid used to prevent the different parts of a plant from getting too hot) should have high specific heat. (c) Air pressure in a car tyre increases during driving. (d) The climate of a harbour town is more temperate than that of a town in a desert at the same latitude. | Learn NCERT solution | Education portal Class 11 Physics | Study online Unit-12 Thermodynamics



Q.3:- Explain why
(a) Two bodies at different temperatures T1 and T2 if brought in thermal contact do not necessarily settle to the mean temperature (T1 + T2)/2.
(b) The coolant in a chemical or a nuclear plant (i.e., the liquid used to prevent the different parts of a plant from getting too hot) should have high specific heat.
(c) Air pressure in a car tyre increases during driving.
(d) The climate of a harbour town is more temperate than that of a town in a desert at the same latitude.

 

 

Answer:-



(a) In thermal contact, heat flows from the body at higher temprature to the body at lower temprature till tempratures becomes equal. The final temprature can be the mean temprature (T1 + T2)/2only when thermal capicities of the two bodies are equal.

(b) This is bcause heat absorbed by a substance is directly proportional to the specific heat of the substance.

(c) During driving, the temprature of air inside the tyre increases due to moion. Accordingto Charle’s law, P ∝ T. Therefore, air pressure inside the tyre increases.

(d) This is because in a harbour town, the relative humidity is more than in a desert town. hence, the climate of a harbour town is without extremes of hot and cold.