Telephone signals are often transmitted over long distances by microwaves. What is the frequency of microwave radiation with a wavelength of 3.5 cm? Express your answer in GHz and using two significant figures.
f = GHz
Microwave signals are beamed between two mountaintops 52 km apart. How long does it take a signal to travel from one mountaintop to the other?
Express your answer in ms and using two significant figures.
t = ms

1) f= 8.6 GHz

2) t= 0.2 ms

Explanation:

1)

⇒     f = 8.6 Ghz (with two significative figures)

2)

       where v= c= speed of light in vacuum = 3*10⁸ m/s

       d= distance between mountaintops = 52 km = 52*10³ m

       ⇒  t = 0.2 ms (with two significative figures)

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