A string is stretched between fixed points separated by 75.0 cm. It is observed to have resonant frequencies of 420 Hz and 315 Hz. There are no other resonant frequencier between these two. The lowest

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A string is stretched between fixed points separated by 75.0 cm. It is observed to have resonant frequencies of 420 Hz and 315 Hz. There are no other resonant frequencier between these two. The lowest resonant frequency for this string is:NEET 2015 (Phase 2)

TestHub · Accepted Answer

Two consecutive resonant frequencies for a string fixed at both ends will be n v 2 l a n d n + 1 v 2 l ⇒ n + 1 v 2 l - n v 2 l = 420 - 315 v 2 l = 105 H z Which is the minimum resonant frequency.

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