We consider a thermodynamic system. If ∆U represent the increase in

1.	We consider a thermodynamic system. If ∆U represent the increase in its energy and W the work done by the system, which of the following statements is true?(a) ∆U = – W in an isothermal process (b) ∆U = – W in an adiabatic process (c) ∆U = W in an isothermal process(d) ∆U = W in an adiabatic process
Answer» (b) ∆U = – W in an adiabatic process According to the first law of thermodynamics ∆Q = AU + W In an adiabatic process, ∆Q = 0. Therefore, ∆U = – W

We consider a thermodynamic system. If ∆U represent the increase in its energy and W the work done by the system, which of the following statements is true?(a) ∆U = – W in an isothermal process (b) ∆U = – W in an adiabatic process (c) ∆U = W in an isothermal process(d) ∆U = W in an adiabatic process

Answer»

(b) ∆U = – W in an adiabatic process

According to the first law of thermodynamics ∆Q = AU + W In an adiabatic process, ∆Q = 0. Therefore, ∆U = – W