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A ground receiver station is receiving a...

A ground receiver station is receiving a signal at 100 MHz, transmitted from a ground transmitter at a height of 300 m located at a distance of 100 km. It is coming via (Given the value of radius of the earth = 6400 km and maximum electron density, `N_(max) = 10^12 m^-3`).

A

space wave

B

sky wave propagation

C

satellite transponde

D

none of these.

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