Television viewers using dish antenna to receive satellite signals do not receive signals in rain because:
- 1. of the small size antenna.
- 2. rain droplets absorb the energy of radio waves.
- 3. rain droplets disperse the energy of radio waves from their original direction.
Which of the above statements are correct?
- AOnly 1
- BOnly 1 and 2
- COnly 2 and 3
- D1, 2 and 3
Show answer and explanation
Correct answer: (d) 1, 2 and 3
Explanation
Satellite TV is sent in the microwave band, which is weakened heavily by rain (Rain Fade).
Rain droplets absorb and also scatter (disperse) the radio-wave energy from its path, cutting the received signal.
The relatively small dish antenna collects limited power, so any loss leaves too weak a signal, validating all three statements.