Gujarati
11.Thermodynamics
normal

If $\Delta Q$ and $\Delta W$ represent the heat supplied to the system and the work done on the system respectively, then the first law of thermodynamics can be written as

where $\Delta U$ is the internal energy

A

$\Delta Q = \Delta U + \Delta W$

B

$\Delta Q = \Delta U - \Delta W$

C

$\Delta Q = \Delta W - \Delta U$

D

$\Delta Q = - \Delta W - \Delta U$

Solution

(b)From FLOT $\Delta Q = \Delta U + \Delta W$
Heat supplied to the system so $\Delta Q →$ Positive
and work is done on the system so $\Delta W →$ Negative
Hence +$\Delta Q = \Delta U – \Delta W$

Standard 11
Physics

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