Question

9. An ideal monatomic gas is adiabatically
compressed so that its final temperature
is twice its initial temperature. What is
the ratio of the final pressure to its initial
pressure?
[Ans: 5.6)​

Answer 1

Answer:

Volume of the gas v=

density

mass

=

ρ

m

and using (PV)

r

= constant,

P

P

′

=

V

′

V

=(

mρ

mρ

)

r

=(

ρ

ρ

′

)

r

Or 128=(32)

r

∴r=log

32

128

∴r=

5

7

=1.4