Which of the following waves are emitted in SONAR?

Options

A. Radio waves
B. Micro waves
C. Ultrasonic waes
D. Gamma rays

Explanation

To determine which waves are emitted in SONAR (Sound Navigation and Ranging), we can analyze the options provided:

1. **Understanding SONAR**:
- SONAR is a technique used to detect objects underwater by emitting sound waves and analyzing the echoes that return after bouncing off objects. It is primarily used in submarines, ships, and for underwater exploration.

2. **Analyzing the Options**:
- **Radio Waves**: These are electromagnetic waves used for communication and are not suitable for underwater detection due to their long wavelength and inability to penetrate water effectively.
- **Microwaves**: Similar to radio waves, microwaves are also electromagnetic waves. They are used in radar and communication but are not effective in underwater applications.
- **Ultrasonic Waves**: These are sound waves with frequencies above the audible range for humans (above 20 kHz). Ultrasonic waves can travel through water and are ideal for SONAR applications, as they can reflect off objects and provide information about their distance and size.
- **Gamma Rays**: These are high-energy electromagnetic waves. They are not used in SONAR as they do not interact with water in a way that would allow for object detection.

3. **Conclusion**:
- Based on the analysis, the correct answer is **Ultrasonic waves** (Option 3). These waves are specifically designed for underwater navigation and detection.

### Final Answer:
The waves emitted in SONAR are **Ultrasonic waves** (Option 3).