(B) According to the first law of thermodynamics,the change in internal energy $\Delta U$ is given by $\Delta Q = \Delta U + dW$,where $\Delta Q$ is t

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In an adiabatic process $\Delta U = -dW$

(B) According to the first law of thermodynamics,the change in internal energy $\Delta U$ is given by $\Delta Q = \Delta U + dW$,where $\Delta Q$ is the heat supplied to the system and $dW$ is the work done by the system. In an adiabatic process,there is no exchange of heat with the surroundings,so $\Delta Q = 0$. Substituting this into the equation,we get $0 = \Delta U + dW$. Therefore,$\Delta U = -dW$.

Class 11 Physics Thermodynamics Adiabatic Process

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Which of the following statements is true? ($\Delta U = \text{increase in internal energy}$,$dW = \text{work done by the system}$)

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A
In an adiabatic process $\Delta U = dW$
B
In an adiabatic process $\Delta U = -dW$
C
In an isothermal process $\Delta U = -dW$
D
In an isothermal process $\Delta U = dW$

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Which of the following statements is true? ($\Delta U = \text{increase in internal energy}$,$dW = \text{work done by the system}$)

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