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First Law of Thermodynamics

Δ U is equal ...

Question

$Δ U$ is equal to

A

Isochoric work

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B

Isobaric work

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C

Adiabatic work

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D

Isothermal work

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Solution

The correct option is C Adiabatic work
According to first law of thermodynamics,
$Δ U = q + W = q - p Δ V$
In isochoric process $(Δ V = 0)$
$(Δ U = q)$
In isobaric process $(Δ p = 0)$
$(Δ U = q)$
In adiabatic process (q = 0)
$(Δ U = W)$
In isothermal process $(Δ T = 0) a n d Δ U = 0$
$∴ Δ U$ is equal to adiabatic work.

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