An ideal gas undergoes an adiabatic expansion from volume \( V \) to \( 2V \). If the initial temperature is \( T \), what is the final temperature? (Assume the ratio of specific heats \( \gamma = \frac{5}{3} \))
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\textbf{Tip:} For adiabatic processes, use \( TV^{\gamma - 1} = \text{const} \) to directly relate initial and final temperatures and volumes.