Question

Part A

Answer 1

Explanation:

Part A,

Wavelength of microwave radiation, $\lambda=3\ cm=0.03\ m$

We know that the microwaves is a type of electromagnetic wave. It is moving with speed of light. Let f is the frequency of the microwave radiation.

$f=\dfrac{c}{\lambda}$

$f=\dfrac{3\times 10^8\ m/s}{0.03\ m}$

$f=10^{10}\ Hz$

$f=10\ GHz$

The frequency of microwave radiation is 10 GHz.

Part B,

Microwave signals are beamed between two mountaintops 55 km apart, d = 55000 m

Let t is the time taken by the signal to travel from one mountaintop to the other. It is given by :

$t=\dfrac{d}{c}$

$t=\dfrac{55000\ m}{3\times 10^8\ m/s}$

$t=0.000183\ s$

$t=0.18\ ms$

Hence, this is the required solution.