Q.

Instrument used to study the behaviour of a vibrating siring is :

A. Barometer
B. Hydrometer
C. (2) Hygrometer
D. (4) Sonometer
Answer» D. (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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