Question

Television signals broadcast from the moon can be received on the earth broadcast from Delhi cannot be received at places about $100km$ distance from Delhi. This is because

• A. There is no atmosphere around the moon
• B. Of strong gravity effect on TV signals
• C. TV signals travel straight and cannot follow the curvature of the earth
• D. There is atmosphere around the earth

Answer 1

The correct option is C TV signals travel straight and cannot follow the curvature of the earth

Television signals are radio waves which all move in a straight line. They cannot pass through the earth surface. When the waves move in a straight line they generally are blocked by the curvature of the earth. But when the broadcast is done from moon, the waves do not have to encounter the earth's curvature and hence, can travel much further distances.

So, the correct answer is option (C).

Fact: The reason why telephone towers and broadcast towers are made very high is to avoid this problem. The higher the tower the longer will the waves travel from it.