Start with c = f(wavelength)
3 X 108 = 1000000(wavelength)
wavelength = 300 m
Then total distance = 20000 m
20000/300 = 66.7 waves
So round up to 67 waves for the approximate
Wavelength = Speed of wave/Frequency
= 3*10^8/1000*10^3
= 300 Meter
Number of waves in between 20 Km way = 20,000/300 = 66.67 ~67 Waves
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