STATEMENT 1 : The audio frequency signals (20 Hz to 20 kHz) cannot be transmitted without distortion over long distances
STATEMENT-2: Noise has its greatest effect when the signal is weak

Options

A. Statement-1 is True. Statement-2 is True Statement-2 is a correct explanation for statement-1
B. Statement is True Statement-2 is True Statement-2 is NOT a correct explanation for Statement-1
C. Statement-1 Is True Statement-2 is False
D. Statement-1 is False. Statement 2 is True

Answer

To analyze the two statements provided in the question, we will break down each statement and evaluate their validity step by step.

### Step 1: Evaluate Statement 1
**Statement 1:** The audio frequency signals (20 Hz to 20 kHz) cannot be transmitted without distortion over long distances.

- **Analysis:**
- Audio frequency signals operate within the range of 20 Hz to 20 kHz.
- When transmitting these low-frequency signals over long distances, the size of the antenna required becomes impractically large (approximately 8 km for effective transmission).
- Additionally, low-frequency signals are more susceptible to distortion due to various factors, including attenuation and interference from other signals.

- **Conclusion:** Statement 1 is true.

### Step 2: Evaluate Statement 2
**Statement 2:** Noise has its greatest effect when the signal is weak.

- **Analysis:**
- In communication systems, noise refers to any unwanted signal that interferes with the transmission of the desired signal.
- When the signal strength is weak, the noise becomes more prominent relative to the signal, making it difficult to distinguish the actual signal from the noise.
- This phenomenon is particularly critical in communication channels where the signal-to-noise ratio (SNR) is low.

- **Conclusion:** Statement 2 is also true.

### Step 3: Relationship Between Statements
- Statement 2 provides a valid explanation for Statement 1. The distortion in transmitting audio frequency signals over long distances is exacerbated by the presence of noise, which has a more significant impact when the signal is weak.

### Final Conclusion
- Both statements are true, and Statement 2 correctly explains Statement 1. Therefore, the correct answer is that both statements are true, and Statement 2 is the correct explanation for Statement 1.