Answer :
Final answer:
The frequency of the seismic wave is 200 Hz.
Explanation:
The frequency of a wave can be calculated using the formula:
frequency = velocity / wavelength
Given that the velocity of the seismic wave is 4000 m/s and the wavelength is 20 meters, we can substitute these values into the formula:
frequency = 4000 m/s / 20 m = 200 Hz
Therefore, the frequency of the seismic wave is 200 Hz.
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