The instrument used to measure sounds under water is
(1) Hygrometer
(2) Hydrophone
(3) Hypsometer
(4) Gramaphone
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HYDROPHONE USED TO MEASURE SOUNDS UNDER WATER
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Sound in water is measured using a hydrophone, which is the underwater equivalent of a microphone. A hydrophone measures pressure fluctuations, and these are usually converted to sound pressure level (SPL), which is a logarithmic measure of the mean square acoustic pressure.
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