Verified Answer :

The correct answer for this question is this one: C) 2.5s. The period and frequency of a water wave if 4.0 complete waves pass a fixed point in 10 seconds is that 2.5 s

Here are the following choices:
A) 0.25s 
B) 0.40s 
C) 2.5s 
D) 4.0s

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