Final answer:
The frequency of a wave with a wavelength of 50m and a speed of 200m/s is calculated to be 4 hertz using the formula frequency equals speed divided by wavelength.
Step-by-step explanation:
The frequency of a wave is calculated using the formula frequency (f) = speed (v) / wavelength (λ). Given a wave with a wavelength of 50m and a speed of 200m/s, we can determine the frequency by dividing the speed by the wavelength. Using the formula, we get f = 200 m/s / 50 m, which equals 4 Hz. Therefore, the frequency of the wave is 4 hertz.