Question

Two different ideal diatomic gases `A` and `B` are initially in the same state. `A` and `B` are then expanded to same final volume through adiabatic and isothermal process respectively. If `P_(A), P_(B)` and `T_(A), T_(B)` represents the final pressure and temperature of `A` and `B` respectively then.
A. `P_(A) lt P_(B)` and `T_(A) lt T_(B)`
B. `P_(A) gt P_(B)` and `T_(A) gt T_(B)`
C. `P_(A) gt P_(B)` and `T_(A) lt t_(B)`
D. `P_(A) lt P_(B)` and `T_(A) gt T_(B)`

Answer 1

Correct Answer - A
For adiabatic process
`P V_(1)^(gamma) = P_(A) V_(2)^(gamma)`
`P_(A) = P ((V_(1))/(V_(2)))^(gamma) ……….(i)`
For isothermal process
`P V_(1) = P_(B) V_(2)`
`P_(B) = P (V_(1))/(V_(2)) ……(2)`
From (1) and (2)
`P_(A) lt P_(B)` [For expansion `V_(2) gt V_(1)]`
any by `PV = nRT T_(A) lt T_(B)`