If pv = 81, then dp dv is at v = 9 equal to - Vidyadip

MCQ

If $pv = 81$, then ${{dp} \over {dv}}$ is at $ v = 9 $ equal to

A
$1$
✓
$-1$
C
$2$
D
None of these

✓

Answer

Correct option: B.

$-1$

b
(b) $pv = 81 \Rightarrow \frac{{dp}}{{dv}} = \frac{{ - 81}}{{{v^2}}} = \frac{{ - 81}}{{81}} = - 1$.

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