Answer
(a) $\lambda = 3.0~m$
(b) $f = 114~Hz$
Work Step by Step
(a) We can find the wavelength.
$\lambda = \frac{v}{f}$
$\lambda = \frac{3.0\times 10^8~m/s}{101.3\times 10^6~Hz}$
$\lambda = 3.0~m$
(b) We can find the frequency of a sound source with this wavelength.
$f = \frac{v}{\lambda}$
$f = \frac{343~m/s}{3.0~m}$
$f = 114~Hz$
