Question

Which waves are used in the device 'SONAR'?

• A. Audible waves
• B. Ultrasound waves
• C. Infrasound waves
• D. Light waves

Hint:

SONAR uses ultrasound waves because they travel well through water and can detect objects over long distances.

Answer 1

The Correct Option is B

Step 1: Understanding SONAR.
SONAR (Sound Navigation and Ranging) is a technique used to detect objects underwater by emitting sound waves and analyzing the reflected waves. The sound waves used in SONAR are typically high-frequency sound waves.

Step 2: Types of sound waves.
- \((A) Audible waves:\) These are sound waves that can be heard by humans, typically in the frequency range of 20 Hz to 20,000 Hz. They are not used in SONAR because they do not travel efficiently through water.
- \((B) Ultrasound waves:\) Correct. Ultrasound waves are high-frequency sound waves above the range of human hearing, typically above 20 kHz. They are widely used in SONAR for their ability to travel long distances underwater.
- \((C) Infrasound waves:\) These are sound waves below the range of human hearing, below 20 Hz. They are not used in SONAR.
- \((D) Light waves:\) These are electromagnetic waves, not sound waves, and are not used in SONAR.

Step 3: Conclusion.
The correct type of waves used in SONAR are ultrasound waves.

Final Answer: Ultrasound waves.