Answer
Please see the work below.
Work Step by Step
(a) We know that
$T=\frac{1}{f}$
We plug in the known values to obtain:
$T=\frac{1}{5.2}$
$T=0.19s$
(b) We know that
$\lambda=vT$
We plug in the known values to obtain:
$\lambda=(0.34)(0.1923)$
$\lambda=0.065m$
