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(i) A person hums in a wall and finds st...

(i) A person hums in a wall and finds strong resonance at frequencies `60 Hz, 100Hz` and `140 Hz`. What is the fundamental frequency of the well? Explain? How deep is the wall ? (velocity of sound `= 344 m//`).
(ii) A violin string `33cm` long vibrates at a fundamental frequency of `440 Hz`. Where shold a finger be pressed on the string board so that its decreased length causes it to vibrate in its fundamental mode at five fourth of its original frequnency.

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