Answer:0.1 hertz
Explanation:
Velocity=20m/s
Wavelength=200m
frequency=velocity ➗ wavelength
Frequency=20 ➗ 200
Frequency=0.1
Frequency=0.1 hertz
The frequency of the water wave is 0.1 Hz
The frequency of a wave is defined as the number of oscillations or the number of wavelengths completed in one second.
Mathematically, the wavelength (λ), frequency (ν), and velocity (v) of the wave are related as:
ν = v/λ
according to the question, v = 20 m/s and λ = 200m, then frequency:
ν = 20/200 Hz
v = 0.1 Hz
Therefore, the frequency of the wave is 0.1 Hz.
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