Physics homework question about waves.

Physics homework question about waves.
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Answer :

“Frequency times wavelength equals speed.” So frequency divided by speed equals wavelength. (Don’t know if this helps but I thought I’d take a crack at it. Info here is from “The Wonders of Physics: An introduction to the physical world.” A deluxe Golden Book, text by Irving Adler, copyright 1966 by Western Publishing Company, New York.)
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