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Distance between the towers, d = 40 km
Height of the line joining the hills, d = 50 m.
Thus, the radial spread of the radio waves should not exceed 50 km.
Since the hill is located halfway between the towers, Fresnel’s distance can be obtained as:
ZP = 20 km = 2 × 104 m
Aperture can be taken as:
a = d = 50 m
Fresnel’s distance is given by the relation,
Where,
λ = Wavelength of radio waves
Therefore, the wavelength of the radio waves is 12.5 cm.
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