A string is stretched between fixed points separated by \( 75.0 \ma...

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A string is stretched between fixed points separated by \( 75.0 \mathrm{~cm} \). It is observed to have resonant frequencies of
\( \mathrm{P} \) \( 420 \mathrm{~Hz} \) and \( 315 \mathrm{~Hz} \). There are no other resonant frequencies between these two. Then, the lowest resonant
W frequency for this string is
[AIEEE 2006; AIIMS 2008; AIPMT 2015]
(a) \( 1.05 \mathrm{~Hz} \)
(b) \( 1050 \mathrm{~Hz} \)
(c) \( 10.5 \mathrm{~Hz} \)
(d) \( 105 \mathrm{~Hz} \)
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