what would be the magnitude of the wavelengths produced directly in front of the source?

what would be the magnitude of the wavelengths produced directly in front of the source?
A source when at rest in a medium produces waves to the right with a velocity v and a wavelength of λ . If the source is set in motion to the left with a velocity Vs ( Vs<v ), what would be the magnitude of the wavelengths produced directly in front of the source?

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