The \(6^{\text {th }}\) harmonic \(\left(f_6\right)=\frac{6 v }{2 l}=900\)
or \(\frac{v}{2 l}=150\)
Hence fundamental frequency of string \(\frac{v}{2 l}\) or \(150 \,Hz\) is missing.
\(3^{\text {rd }}\) multiple of \(150\) which is \(450\) is also missing.
Hence required frequencies are \(150,450\) .
$y=\left(10 \cos \pi x \sin \frac{2 \pi t }{ T }\right) cm$
$x=\frac{4}{3} cm$ આગળ રહેલા કણનો કંપવિસ્તાર.....$cm$ હશે