Question

∆U is equal to

A)isochoric work
B)isobaric work
C)adiabatic work
D)isothermal work

please i want explanation also

Answer 1

∆U is equal to D)isothermal work.

Explanation:

Isothermal process is the process in which temperature of the system remains constant. Therefore, internal energy remains constant.

For an ideal gas in an isothermal process, ∆U=0=Q-W.

where, ∆U= internal energy
             Q = heat absorbed or released
             W = work done by the system or on the system

Answer 2

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This question can be solved by;

According to first law of thermodynamics ,

∆U = q + W = q - p∆V

in isochoric process (∆v = 0)
∆U = q

in isobaric process (∆p =0)
∆U = q

in adiabatic process ( q = 0)

∆U = W

in isothermal process (∆T = 0 )
and ∆U = 0

•°• ∆U is equal to adiabatic work.

so, answer is option C)

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