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Four complete waves pass the duck in one second the frequency of this wave is

User Shamazing
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The frequency of a wave is the number of complete oscillations passing a given point per second.

In this case, assuming the duck is stationary, we have 4 complete waves passing the duck in one second: therefore, the frequency of the wave is

f= (4)/(1 s)=4 Hz
User Hustljian
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