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Television signals broadcast from the Moon can be received on the Earth, while TV broadcasts from Delhi cannot be received at places about 100 km away from Delhi. This is because

1. There is no atmosphere around the Moon
2. Of strong gravitational effect on TV signals
3. TV signals travel straight and cannot follow the curvature of the Earth
4. There is atmosphere around the Earth

Correct answer: TV signals travel straight and cannot follow the curvature of the Earth

Solution

TV signals are electromagnetic waves that generally travel in straight lines. Over large distances, the curvature of the Earth blocks line-of-sight reception unless the signal is reflected or relayed. That is why a broadcast from the Moon can be received, but a local broadcast cannot be received far beyond the horizon.

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