Answer
Please see the work below.
Work Step by Step
(a) we know that angular frequency can be determined as
$\omega=2\pi f$
We plug in the known values to obtain:
$\omega=2\pi (4.86\times 10^6)$
$\omega=3.05\times 10^7\frac{rad}{s}$
(b) We can find the wave number as
$k=\frac{2\pi}{\lambda}$
We plug in the known values to obtain:
$k=\frac{2\pi}{0.313\times 10^{-3}}$
$k=2\times 10^4m^{-1}$
(c) We know that
$v=f\lambda$
We plug in the known values to obtain:
$v=4.86\times 10^6\times 0.313\times ^{-3}$
$v=1520\frac{m}{s}$
