simple physics question?

Question

if an ocean wave passes a stationary point every 3 seconds and has a velocity of 12 m/s. what is the wavelength?

Answer 1

Speed of the wave = Frequency x Wavelength

12=3x

x=4ms2

Answer 2

Unfortunately, I must disagree with the above:
one wave every 3 seconds doesn't mean that frequency is 3 /s or 3 Hz - frequency of the waves tells us the number of waves that pass a stationary point per second, so the frequency is 1/3 /s or 1/3 Hz. (In this case, 3 seconds is the period of the wave.)
The equation of the waves that bind speed (c), frequency (ni) and wavelenght (lambda), gives us: c = lambda * ni. We solve for lambda:
lambda = c / ni = 12 ms^-1 / (1/3) s^-1 = 3*12 m = 36 m.

Answer 3

Nothing. It's all a government cover up.