In an adiabatic process $90J$ of work is done on the gas. The change in internal energy of the gas is ....... $J$
A$-90 $
B$+90 $
C$0 $
D
Depends on initial temperature
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B$+90 $
b (b) For adiabatic process $\Delta Q = 0$
From $\Delta Q = \Delta U + \Delta W$==> $0 = \Delta U - 90$ ==> $\Delta U = + 90J$
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