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The work done to  contract a gas in a cylinder, is 462 joules. 128 joule energy is evolved in the process. What will be the internal energy change in the process

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a
+590 joules
b
-334 joules
c
+334 joules
d
-590 joules

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detailed solution

Correct option is C

As the work is done on system, it will be positive i.e. W=+462 joule, q=−128 joule  (heat is evolving) From the 1st law of thermodynamics             ΔE=q+w=(−128)+(+462)=+334 Joules.

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