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How does active sonar differ from passive sonar?

April 26, 2017active differ passive sonar

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How does active sonar differ from passive sonar?

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Passive sonar, as the name implies, involves listening only. It only works when whales are vocalizing, and that simply is not frequently enough to protect whale populations. Active sonar, by contrast, emits a sound wave and then listens for the sound to bounce back.