Large bandwidth for higher data rate is achieved by using

Options

A. high frequency carrier wave
B. high frequency audio wave
C. low frequency carrier wave
D. low frequency audio wave

Explanation

**Step-by-Step Solution:**

1. **Understanding Bandwidth and Data Rate**:
- Bandwidth refers to the range of frequencies that a communication channel can transmit. It is defined as the difference between the maximum and minimum frequencies of the signal.
- A larger bandwidth allows for a higher data rate, meaning more information can be transmitted in a given amount of time.

2. **Role of Carrier Waves**:
- In communication systems, especially for audio signals, the original signals (like voice) have low frequencies. To transmit these signals over long distances, they need to be combined with a carrier wave.
- A carrier wave is a high-frequency signal that can carry the information of the lower frequency signal.

3. **Superposition of Signals**:
- The process of combining the audio signal with the carrier wave is called superposition. This allows the low-frequency audio signal to be transmitted effectively over long distances.
- The carrier wave must have a high frequency to ensure that the combined signal has a large bandwidth.

4. **Importance of High Frequency**:
- The higher the frequency of the carrier wave, the larger the bandwidth that can be achieved. This is because bandwidth is directly proportional to the frequency of the carrier wave.
- Therefore, to achieve a large bandwidth for higher data rates, a high-frequency carrier wave is essential.

5. **Conclusion**:
- To summarize, a large bandwidth for higher data rates is achieved by using a high-frequency carrier wave. This allows for efficient transmission of data over long distances.

**Final Answer**: Large bandwidth for higher data rate is achieved by using a high-frequency carrier wave.

---