A transistor-oscillator using a resonant circuit with an inductor L (of negligible resistance) and a capacitor C in series produce oscillations of frequency f. If L is doubled and C is changed to 4C, the frequency will be:-

Question

( A ) $\frac f2$
( B ) $8f$
( C ) $\frac f{2\sqrt2}$
( D ) $\frac f4$