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"Thank you and your employees for an excellent transcription and restoration. As this was my mom's piano performance on a 78, it is priceless to my brother and the rest of my extended family. As an electronics technician with my own business, I am glad that I trusted the restoration to professionals such as yourself and your workers. I thank you ..."

Wavelength

Of a sinusoidal plane progressive wave. The perpendicular distance between two wavefronts in which the phases differ by one complete period. The wavelength is equal to the wave velocity divided by the frequency.