Hydroscope is an instrument that shows changes in: (1) Sound under water (2) Atmospheric humidity (3) Density of liquid (4) None of these

Hydroscope is an instrument that shows changes in: (1) Sound under water (2) Atmospheric humidity (3) Density of liquid (4) None of these
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(4) None of these Explanation: Hydroscope is an optical device for enabling a person to see an object at a considerable distance below the surface of water by means of a series of mirrors enclosed in a steel tube. Hydrophone is an instrument used for recording sound under water. It is the underwater equivalent of a microphone that measures pressure fluctuations, and these are usually converted to sound pressure level (SPL), a logarithmic measure of the mean square acoustic pressure.
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Last Answer : wave form of the sound

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