The heat capacity at constant volume is the heat capacity at constant pressure.
ID: 949751 • Letter: T
Question
The heat capacity at constant volume is the heat capacity at constant pressure. always higher than always lower than always the same of sometimes higher, sometimes What is the reason for the answer to question 17? At constant volume, part of the incoming heat is lost as work At constant pressure, work is done on the system At constant volume, the change in temperature depends only on the change in internal energy, not on the work At constant pressure, the change in temperature depends only on the heat, not on the work At constant pressure, the change in internal energy is a state functionExplanation / Answer
17) Cv is always lower than Cp.
18) option c the correct answer.
Explanation : In a constant pressure process, part of the heat supplied gets utilized in increasing the volume of the system, or in other words for expansion. Whereas in a constant volume process, all the heat supplied is used in increasing the internal energy of the system. Internal energy being a function of temperature, the temperature of the system rises. The volume of the system being constrained, there is no scope for expansion.
Hence more amount of energy has to be supplied to a constant pressure process to increase the system's temperature by the same amount, because some of this energy is lost due to expansion work done by the system. Hence the specific heat at constant pressure always exceeds the specific heat at constant volume.
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