Amplitude modulation is used for broad casting because

Options

A. it is more noise immune than other modulation systems
B. it requires less transmitting power compared with other systems
C. its use avoids receiver comlexity
D. no other modulation system can provide the necessary bandwidth faithful transmission

Answer

### Step-by-Step Solution:

1. **Understanding Amplitude Modulation (AM)**:
- Amplitude Modulation is a technique used to encode information in a carrier wave by varying its amplitude. This means that the strength (amplitude) of the carrier wave is changed in accordance with the information signal (like audio).

**Hint**: Recall that in AM, the amplitude of the carrier wave is varied to represent the information being transmitted.

2. **Noise Immunity**:
- One of the primary reasons for using AM in broadcasting is its relative immunity to noise. AM signals can be received clearly even in the presence of noise, making them suitable for long-distance transmission.

**Hint**: Consider how noise affects different types of modulation and why AM might be less affected.

3. **Power Requirements**:
- AM requires less transmitting power compared to other modulation techniques. This is beneficial for broadcasting as it allows for wider coverage with less energy consumption.

**Hint**: Think about the efficiency of power usage in different modulation techniques and how this impacts broadcasting.

4. **Simplicity of Receiver Design**:
- AM signals can be demodulated using simple circuits. A basic AM receiver only needs a diode and a capacitor to extract the audio signal from the modulated wave. This simplicity reduces the cost and complexity of receivers.

**Hint**: Reflect on the components required for demodulating AM signals and how they compare to other modulation types.

5. **Common Usage**:
- AM is widely used for broadcasting radio signals. Its ability to transmit over long distances and penetrate through obstacles makes it a popular choice for radio communication.

**Hint**: Consider the practical applications of AM in everyday communication, especially in radio broadcasting.

### Conclusion:
Amplitude modulation is preferred for broadcasting due to its noise immunity, lower power requirements, simplicity of receiver design, and widespread usage in radio communication.