A) \[\frac{3}{4}\]
B) \[\frac{5}{7}\]
C) \[\frac{3}{5}\]
D) \[\frac{9}{11}\]
Correct Answer: B
Solution :
The frequency of 3rd fundamental mode of vibration. \[{{v}_{3}}=\frac{5v}{4L}\] The frequency of 4th fundamental mode of vibration \[{{v}_{4}}=\frac{7v}{4L}\] \[\frac{{{v}_{3}}}{{{v}_{4}}}=\frac{5}{7}\]
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