A sound is produced by plucking a string in a \( \mathrm{P} \) musi...

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A sound is produced by plucking a string in a
\( \mathrm{P} \) musical instrument, then
(a) the velocity of wave in the string is equal to the velocity of sound in the string
(b) the frequency of the wave in the string is equal to the frequency of the sound produced
(c) the wave in the string is progressive
(d) the tension in the string varies from point to point.
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