A source when at rest in a medium produces waves with a velocity v and a wavelength of lamba. If the source is set in motion with a velocity vs
what would be the wavelengths produced directly in front of the source?
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Three phases can be distinguished in a soil: free phase (minerals and organic material, among which living organisms) liquid phase (water and the therein dissolved nutrients) gasous phase (e.g. oxygen of importance for the respiration of roots)
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