In TV broadcasts, radio waves carry both sound and picture signals. This means that option (a) is correct.
Let's break it down:
- Sound signals are indeed encoded using amplitude modulation (AM) in TV broadcasts. Amplitude modulation alters the strength or amplitude of the signal to represent sound waves. This modulation allows the receiver to extract the audio information from the radio waves.
- Picture signals, on the other hand, are encoded using frequency modulation (FM). Frequency modulation involves varying the frequency of the carrier wave in accordance with the audio signal. This modulation technique helps transmit the visual information accurately.
Therefore, both sound and picture signals in TV broadcasts rely on radio waves for transmission, with sound signals encoded using amplitude modulation and picture signals encoded using frequency modulation.
