Calcuate the stress for one litre of perfeect gas, at a pressure of 72 cm of hg. When it is compressed isothermally to a volume of 900 cc.

Options

A. `9. 88 xx 10 ^(3) N//m^(2)`
B. `10.88 xx 10 ^(3) N//m^(2)`
C. `1.088 xx 10^(3) n//m^(2)`
D. ` 2xx 10 ^(3) N//m^(2)`

Answer

B

Explanation

Let p= pressure of the gas in compressed state .Condition for isothermal process is
` p xx 900 = 72 xx 100 rArr p = 80 cm`
Stress = increase in pressure = `( 80 - 72)= 8 cm` of Hg
=` 0.08 xx 13.6 xx 10^(3) xx 10 = 10.88 xx 10 ^(3) N//m^(2)`