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

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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:
A. T+(2)/(3xx0.0821)
B. T-(2)/(3xx0.0821)
C. (T)/(2^(5//3-1))
D. (T)/(2^(5//3+1))

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Delta U=W
nCV(T_(2)-T)= -Pxx(V_(2)-V_(1))
(3)/(2)R(T_(2)-T)= -1 " " :. T_(2)=T-(2)/(3xx0.0821)