First slide

Calculation of pressure

Question

The kinetic energy of molecules of a gas per litre of its volume is found to be 300 joules. Then its pressure will be

Moderate

A

$3 x 10^{5} N / m^{2}$
B

$6 x 10^{5} N / m^{2}$
C

$1 x 10^{5} N / m^{2}$
D

$2 x 10^{5} N / m^{2}$

Solution

$P = \frac{2}{3} E w h e r e E i s k i n e t i c e n e r g y p e r u n i t v o l u m e P = \frac{2}{3} \frac{300}{10^{- 3}} = 2 x 10^{5}$

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