Question

If ΔU and ΔW represent the increase in internal energy and work done by the system respectively in a thermodynamical process, which of the following is true?(a) ΔU = -ΔW, in an adiabatic process(b) ΔU = ΔW, in an isothermal process(c) ΔU = ΔW, in an adiabatic process(d) ΔU = -ΔW, in an isothermal process

Answer 1

Hey mate here is your answer.....

In an isothermal process dQ=0

So 0=dW+dQ

=>dQ= -dW.

So the option D is correct.

Hope it helps you.

Answer 2

Answer:

According to the first law of thermodynamics:

Delta Q = delta U + delta W ........(1)

Where,

Delta Q = heat supplied to the system

Delta U = increase in internal energy of the system

Delta W = work done by the system

For an adiabatic process:

Delta Q = 0

As a result equation (1) becomes

Delta U = — delta W

HOPE THIS HELPS YOU!