The heat capacity at constant volume of an ideal gas consisting of monatomic molecules is `3//2` R ( where R is the gas constant ) . The heat capacity at constant pressure is `:`

Options

A. R
B. `( 5)/( 2) R `
C. ` ( 1)/( 2) R `
D. `( 3)/( 2) R `

Answer

B

Explanation

New pressure `= ( 40)/( 100)`
Since PV is constant, new volume should be `( 100)/( 40) ` times
i.e. `( 100)/( 40) xx 100 = 250` ml
Volume of bulb A = 100ml
Volume of bulb B = 250 - 100 = 150 ml