A group of swimmers is resting in the sun on an off shore raft. They estimate that 2.2 m seperates a trough from an adjacent crest of surface waves on a lake. They count 18 crests that pass by the raft in 31s. How fast are the waves moving?
F= 1/t v=wavelength x frequency
The Attempt at a Solution
4.4 x 31? or 4.4 x 18? or something else?
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