Question

Telephone signals are often transmitted over long distances by microwaves. what is the frequency of microwave iradiation with a wavelength of 3.50 cm

Answer 1

c = speed of light = 3.00 x 10^5 km/s = 3.00 x 10^8 m/s
  λ = wavelength of the microwave radiation = 3.50 cm = 0.035 m
  f = frequency (in Hertz) = to be determined
    f = c/λ = 3.00 x 10^8 m/s / 0.035 m
  f = 8.57 x 10^9 Hz Frequency

Answer 2

The computation for this problem would be:

The formula that we will be using is: f = c/λ

Where:

c = speed of light = 3.00 x 10^5 km/s convert it to meters, so: 3.00 x 10^8 m/s 

λ = wavelength of the microwave radiation = 3.50 cm convert this to meters, so: 0.035 m 

f = frequency (in Hertz) 
f = c/λ

= 3.00 x 10^8 m/s / 0.035 m 

f = 8.57 x 10^9 Hz Frequency