1.

In figure, three isothermal processes are shown for the same gas and for same change in volume (V_(i) - V_(f)) but at different temperature. If Delta Q_(1), Delta Q_(2) , " and " Delta Q_(3)are the heat transferred in the respective process, then

Answer»

`Delta Q_(1) = DeltaQ_(2) = DeltaQ_(3)`
`DeltaQ_(1) gt DeltaQ_(2) gt DeltaQ_(3)`
`Delta Q_(1) lt DeltaQ_(2) lt DeltaQ_(3)`
`Delta Q_(1) = DeltaQ_(2) = DeltaQ_(3) = 0 `

Solution :In an isothermal process, `Delta U = 0 `,
` :. Q = 0 + W` (from FIRST law of thermodynamics)
Area of `P - V` is GREATER for process 1, so W and HENCE `Q_(1) ` is GREATEST.


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