A violin string $15\mathrm{.}1$ cm long and fixed at both ends oscillates in its $n=2$ mode. The speed of waves on the string is $234\frac{m}{s},$ and the speed of sound in air is $348\frac{m}{s}.$ What are $($a$)$ the frequency and $($b$)$ the wavelength of the emitted sound wave?

$($a$)$ Number

Units $$

$($b$)$ Number

Units