One mole of an ideal monoatomic gas at temperature T and volume 1L expands to 2L against a constant external pressure of one atm under adiabatic conditions, then final temperature of gas will be:

Options

A. `T + (2)/(3 xx 0.0821)`
B. `T- (2)/(3 xx 0.0821)`
C. `(T)/(2^(5//3-1))`
D. `(T)/(2^(5//3+1))`

Answer

B