# Question #1ef6f

In first case, because $L = {\lambda}_{1} / 2$, the fund freq is ${f}_{1} = \frac{v}{\lambda} _ 1 = \frac{v}{2 L}$
In second case, because $\frac{3 L}{4} = {\lambda}_{2} / 4$, the fund freq is ${f}_{2} = \frac{v}{\lambda} _ 2 = \frac{v}{3 L}$
So ${f}_{2} = \frac{2}{3} {f}_{1} = 260 H z$