Change in frequency when the source is moving away:

$\overline{){{\mathbf{f}}}_{{\mathbf{0}}}{\mathbf{=}}\frac{\mathbf{v}}{\mathbf{v}\mathbf{}\mathbf{+}\mathbf{}{\mathbf{v}}_{\mathbf{s}}}{{\mathbf{f}}}_{{\mathbf{s}}}}$

A student knows that an ambulance siren has a frequency of f_{s} = 399 Hz. He measures, when the ambulance is approaching him. The frequency f_{o} = 414 Hz. Assume the speed of sound is v = 343 m/s in this problem.

If ambulance is moving away with the same speed (v_{s} = 12.89 m/s), what is the wavelength measured by the student in meters?

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