Which type of sonar does not emit sound waves?

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Multiple Choice

Which type of sonar does not emit sound waves?

Explanation:
The key idea is distinguishing sonar by whether it emits sound. Passive sonar does not transmit anything; it simply listens through hydrophones for sounds in the environment—noise from ships, marine life, and other sources. Active sonar, on the other hand, sends out acoustic pulses (pings) and then listens for echoes to detect and locate objects. Because the question asks for the type that does not emit sound waves, the best choice is passive. The other option would imply emission, which active sonar does, so it isn’t correct.

The key idea is distinguishing sonar by whether it emits sound. Passive sonar does not transmit anything; it simply listens through hydrophones for sounds in the environment—noise from ships, marine life, and other sources. Active sonar, on the other hand, sends out acoustic pulses (pings) and then listens for echoes to detect and locate objects. Because the question asks for the type that does not emit sound waves, the best choice is passive. The other option would imply emission, which active sonar does, so it isn’t correct.

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