Instrument used to study the behaviour of a vibrating siring is : (1) Barometer (2) Hydrometer (3) (2) Hygrometer (4) (4) Sonometer

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Answer :

(4) Sonometer Explanation: A Sonometer is a device for demonstrating the relationship between the frequency of the sound produced by a plucked string, and the tension, length and mass per unit length of the string. These relationships are usually called Mersenne's laws after Marin Mersenne (1588-1648), who investigated and codified them.

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