What is the period of a wave if 20 crests pass an observer in 4 seconds?
80 s
0.2 s
5...
![Physics](/tpl/images/cats/fizika.png)
Physics, 16.10.2021 22:00, meganwintergirl
What is the period of a wave if 20 crests pass an observer in 4 seconds?
80 s
0.2 s
5 s
4 s
![answer](/tpl/images/cats/otvet.png)
Answers: 3
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