Two moles of an ideal monoatomic gas occupies a volume $V$ at $27^{\circ}C$. The gas expands adiabatically to a volume $2V$. Calculate (a) the final temperature of the gas and (b) change in its internal energy. <br>

Question

https://clay6.com/mpaimg/1239_a.jpg

( A ) 2
( B ) 3
( C ) 1
( D ) 4