A series LCR circuit with $L= 0.12 H,C= 480\;nF,R= 23 \Omega $ is connected to a $230\;v$ variable frequency supply .For What frequencies of the circuit half the power at resonant frequency . What is the Q factor of the given circuit ?

Question

$\begin{array}{1 1} 2.174 \\ 0.217 \\ 21.74 \\ 217.4 \end{array} $