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Apply the first law of thermodynamics to...

Apply the first law of thermodynamics to an isochoric process explain.

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First law of thermodynamics, `dQ=dU+dW`
For an isochoric process, `dV=0`. Hennce `dW=PdV=0`
`:. dQ=dU`
The amoutn of heat supplied will be used to increases the internal energy of the system.
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Knowledge Check

  • In an isochoric process

    A
    Work done is constant
    B
    Volume changes, work done remains same
    C
    Volume remains constant and no work is done by the system
    D
    Both volume and work done changes.

  • Which one of the following equation does not correctly represent the first law of thermodynamics for the given process involving an ideal gas? (Assume not expansion work is zero)

    A
    isothermal process: q= - w
    B
    isochoric process: `Delta U = q`
    C
    Cyclic process: q= - w
    D
    Adiabatic process: `Delta U = - w`

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