Q. All commercial vessels are equiped with

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Q. AHDs stands for

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Q. Low frequency sonars are used for broad

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Q. Acoustic Harassment Devices (AHDs), performing function in warning marine

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Q. Marine mammals, such as dolphins and whales, producing sound ranges from

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Q. In water, seismic eruptions raises noise up to

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Q. Source levels for fish tracking ranges between

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Q. Passive sonar, functioning as detecting acoustic signal in

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Q. Sonar is used to locate and assess fish shoals, in order to

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Q. Thunder and lightning raises noise level around

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Q. Sources of sound in Ocean, examplified as

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Q. Sonar is used for scientific research and

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Q. Wind blowing produces sounds in water, ranges between

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Q. Higher sounds are mostly due to oscillations of bubbles in the

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Q. China and France, started an underground nuclear testing in

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Q. Cracking in ice, produces sound pulses, approximately

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Q. Mid frequency sonars are participated in submarine detection and

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Q. "SONAR" stands for

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Q. Dredging deliver sounds with an average intensity, ranges between

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Q. Low frequency sonars has a frequency up to

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