A stretched string of length l fixed at both ends can sustain stationary waves of wavelength given by -

• A

  $\mathrm{\lambda }={\mathrm{n}}^2/2\mathrm{\ell }$

• B

  $\mathrm{\lambda }=\frac{{\mathrm{\ell }}^2}{2\mathrm{n}}$

• C

  $\mathrm{\lambda }=\frac{2\mathrm{\ell }}{\mathrm{n}}$

• D

  $\mathrm{\lambda }=2\mathrm{\ell n}$