Question

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

Answer 1

Answer:

△U=q+W

for an adiabatic process, q=0

∴△U=W

i.e; increase or decrease in Internal energy is equal to work done.