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Q.

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

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a

the TV programme consists of both audio and video signals

b

the TV signals are less powerful than radio signals

c

the receiver antenna is unable to detect the signal at a distance greater than 100 km

d

the surface of earth is curved like a sphere

answer is D.

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Detailed Solution

Signal waves travel in a straight line from the transmitting antenna to the receiving antenna. The signal transmitted from a TV tower cannot be received beyond a certain distance because the surface of the Earth is curved. Signal waves transmitted from a transmitter get absorbed or blocked by the curvature of Earth and are not received.

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