• # question_answer The frequency of a vibrating wire is$f$. If  tension is doubled, density is halved and diameter is doubled, then the new frequency will be- A) $f$                              B)  $f\sqrt{2}$C) $2f$                            D) $4f$

If l be the length of the wire then frequency $f=\frac{1}{lD}\,\sqrt{\frac{T}{\pi \rho }}$ When tension T is doubled, density p is halved, diameter D is doubled f would remain the same.