Which statement about active sonar is true?

Which statement about active sonar is true?

• A. It does not transmit sound waves
• B. It transmits sound waves
• C. It is used only by submarines
• D. It cannot determine bearing

Answer: (B)

Active sonar works by sending out a burst of sound into the water and listening for echoes to detect and locate objects. That emission of sound waves is what makes it active, so the statement that it transmits sound waves is true. It’s used by a variety of platforms, not just submarines. By analyzing the direction of the received echoes and the timing of the pulse, active sonar can determine bearing. The other statements aren’t correct because active sonar does transmit sound waves, is not limited to submarines, and can determine bearing.

Active sonar works by sending out a burst of sound into the water and listening for echoes to detect and locate objects. That emission of sound waves is what makes it active, so the statement that it transmits sound waves is true. It’s used by a variety of platforms, not just submarines. By analyzing the direction of the received echoes and the timing of the pulse, active sonar can determine bearing. The other statements aren’t correct because active sonar does transmit sound waves, is not limited to submarines, and can determine bearing.