Question

how can the body be made to vibrate for a desired length of time​

Answer 1

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Time taken by the sound to reach from A to B directly .... By varying the tension, we can get the desired frequency.

Answer 2

By varying the tension in the body we can get the desired frequency.

Explanation:

• Let's suppose there are two points A and B and the sound was are traveling between Point A and B.
• Sound waves are produced by the vibration of objects. It a form of energy, therefore, some waves are dissipated in the surrounding in the form of energy and some travel between A and B points.
• Time taken by the sound waves to travel between the fixed point can be changed by varying the tension. In this way we can get the desired frequency.