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A stretched string of length $l,$ fixed at both ends can sustain stationary waves of wavelength $\lambda ,$ given by
  • A$\lambda = \frac{{{n^2}}}{{2l}}$
  • B$\lambda = \frac{{{l^2}}}{{2n}}$
  • C$\lambda = \frac{{2l}}{n}$
  • D$\lambda = 2l\;n$
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