A stretched string of length l, fixed at both ends can sustain stationary waves of wavelength $\mathrm{\lambda }$, given by

• A

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

• B

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

• C

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

• D

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