The frequency of such a tsunami wave is 0.00046 Hz.
The frequency of any wave is given by the formula,
f = speed of wave/wavelength of wave.
Now, for the tsunami wave, the speed is given to be 750km/h and the the wavelength is 450km.
So, converting the speed and wavelength into standard units,
Speed = 208.33 m/s.
Wavelength = 450000m.
Putting values,
Frequency of tsunami wave = 208.33/450000
Frequency of tsunami wave = 0.00046 Hz.
So, the frequency of the tsunami wave is 0.00046 Hz.
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