Answer
a. 10 GHz.
b. $3.3 \times 10^{-5} s$.
Work Step by Step
a. $$Frequency = \frac{speed}{wavelength} = \frac{3 \times 10^{8} m/s}{0.03 m} = 1.0 \times 10^{10} Hz = 10 GHz$$
b.
If c denotes the speed of light, then $d = (2)(5000m) = ct$. Solve for t = d/c.
$$\frac{10000 m }{300,000,000 m/s} = 3.3 \times 10^{-5} s $$
