A string fixed at both ends is in resonance in its $2^{nd}$ harmonic with a tuning fork of frequency $f_1$. Now its one end becomes free. If the frequency of the tuning fork is increased slowly from $f_1$ then again a resonance is obtained when the frequency is $f_2$. If in this case the string vibrates in $n^{th}$ harmonic then
  • A$n = 3, f_2 =\frac{3}{4}f_1$
  • B$n = 3, f_2 =\frac{5}{4}f_1$
  • C$n = 5, f_2 =\frac{5}{4}f_1$
  • D$n = 5, f_2 =\frac{3}{4}f_1$
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