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

sky wave

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ground wave

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sea wave

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both A and B

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Solution

The correct option is D both A and B
Sea waves travel in a straight line thus, they can only be used for in line communication. Whereas sky waves and ground waves are used for larger distances.

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Television signals on earth cannot be received at distances greater than 100 km from the transmission station. The reason behind this is that

Which one of the following does not consist of transverse waves ?

(a) light emitted by a CFL.

(b) TV signals from a satellite.

(d) musical notes of an orchestra

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