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In an adiabatic expansion of a gas initi...

In an adiabatic expansion of a gas initial and final temperatures are `T_(1)`and `T_(2)` respectively, then the change in internal energy of the gas is

A

`(R )/(lambda)(T_(2)-T_(1))`

B

`(R )/(lambda-1)(T_(1)-T_(2))`

C

`R(T_(1)-T_(2))`

D

Zero

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A
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