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

To solve the question regarding how large bandwidth for higher data rate is achieved, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Bandwidth**:
- Bandwidth refers to the range of frequencies within a given band that can be used for transmitting data. It is essentially the difference between the highest and lowest frequencies in that band.

2. **Carrier Waves**:
- A carrier wave is a continuous electromagnetic wave that can be modulated with an input signal for the purpose of conveying information. The carrier wave's frequency is crucial as it determines the bandwidth available for data transmission.

3. **Relationship Between Bandwidth and Data Rate**:
- The data rate (or bit rate) is the amount of data that can be transmitted in a given amount of time. According to the Nyquist theorem, the maximum data rate is directly proportional to the bandwidth of the channel. This means that a larger bandwidth allows for a higher data rate.

4. **Modulation**:
- Modulation is the process of varying one or more properties of a carrier wave in accordance with the information signal. The modulation technique used can affect the efficiency of bandwidth usage.

5. **Higher Frequency Carrier Waves**:
- To achieve a large bandwidth and, consequently, a higher data rate, it is essential to use higher frequency carrier waves. Higher frequencies can accommodate more data and allow for more carrier waves to exist within the same bandwidth.

6. **Conclusion**:
- Therefore, to achieve a large bandwidth for higher data rates, one should use higher frequency carrier waves.

### Final Answer:
Large bandwidth for higher data rate is achieved by using **higher frequency carrier waves**.

---