Plz help me out..ASAP..A 75-kHz radio transmitter sends an electromagnetic wave to a receiver L = 20.0 km away?
A 75-kHz radio transmitter sends an electromagnetic wave to a receiver L = 20.0 km away.The signal also travels to the receiver by another path where it reflects from a helicopter as shown. Assume that there is a 180° phase shift when the wave is reflected.
(a) What is the wavelength of this EM wave?
answer in km
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- ?Lv 410 years agoFavourite answer
Lots of extra information that is not really needed.
All you need to know is: c = νλ = frequency * wavelength where c = 3.8E8 m/sec aka speed of light.
solve for the wavelength λ = c/ν
λ = (3E8m/sec)/(75000/sec) 1Hz = 1/sec
λ = 4000m or 4km