A string is stretched betweeb fixed poin...

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

55 Hz

105 Hz

155 Hz

210 H z

Text Solution

Verified by Experts

The correct Answer is:

The resonant frequencies are n, 2n 3n , …
` :. 2n - n = 3n - 2n = ….. = n`
` n = 420 - 315 = 105 ` Hz

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