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A signal emitted by an antenna from a certain point can be received at another point on the surface of the Earth in the form of

1. Sky wave
2. Ground wave
3. Sea wave
4. Both (A) and (B)

Correct answer: Both (A) and (B)

Solution

A radio signal can reach another point on Earth either as a ground wave or as a sky wave, depending on the frequency and propagation conditions. Hence both modes are possible.

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