ٹیلی ویژن سگنلز عام طور پر ______ کی وجہ سے ایک خاص فاصلے سے زیادہ موصول نہیں ہو سکتے؟
A. Weak antenna
B. None of these
C. Absorption of signals in the air
D. Curvature of earth
Explanation
Television signals cannot be received ordinarily beyond a particular distance due to the curvature of the earth.
Key Points
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.
This is due to, after going a certain distance the frequency of television signals decreases while their wavelength increases.
Signal waves transmitted from a transmitter get absorbed or blocked by the curvature of Earth and are not received.
Additional Information
Signal:
Information converted in electrical form and suitable for transmission is called a signal.
