Figure below is showing that one mole of an ideal gas is fitted with a frictionless piston. Total volume of the gas is V_i and pressure of the gas inside is p. If external pressure is p_ex which is greater than p is applied, piston is moved inward till the pressure inside becomes equal to p_ex.
What does the shaded area represents in the figure ?

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Pressure change

Work done

Volume change

Temperature change

answer is A.

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Detailed Solution

The shaded area shows work done on an ideal gas in a cylinder when it is compressed by a constant external pressure

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