First slide

Heat Engine; Carnot Engine and refrigerator

Question

A gas for which $δ = \frac{4}{3}$ , is heated at constant pressure, what percentage of total heat is supplied for doing external work?

Moderate

A

50%
B

25%
C

35%
D

40%

Solution

P=constant
$δ= \frac{4}{3}$
$p e r c e n t a g e o f t o t a l h e a t s u p p l i e d f o r d o i n g e x t e r n a l w o r k i s \frac{dW}{{(dQ)}_{p}} = (1- \frac{1}{δ}) ×100$
$s u b s t i t u t e δ= \frac{4}{3}$
$p e r c e n t a g e o f t o t a l h e a t s u p p l i e d = (1- \frac{3}{4}) ×100= \frac{1}{4} \times 100 = 25 %$

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