A string of mass per unit length mu = 6 ...

A string of mass per unit length `mu = 6 xx 10^(-3)` kg/m is fixed at both ends under the tension 540 N. If the string is in resonance with consecutive frequencies 420 Hz and 490 Hz. Then find the length of the string?

2.1 m

1.1 m

4.8 m

4.2 m

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