Question

A wave is traveling at 36 m/s. If its wavelength is 12 m, how many times does a wavelength move across a set point every second?

one time
three times
twelve times
thirty-six times

Answer 1

Frequency f = v/λ = 36 m/s ÷ 12 m = 3 s⁻¹, so a wavelength passes a fixed point 3 times per second.