An ocean wave travels 17.1 m in 6.7 s. The

distance between the two nearest wave crests
is 5.1 m.
What is the frequency of the wave?
Answer in units of H

1 answer

speed of wave = 17.1/6.7 = 2.55 m/s

wavelength = speed * period
5.1 m = 2.55 m/s * T
T = 2 seconds

f = 1/T = 1/2 = .5 Hz