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What is the number of wavelengths that pass a given point each second called?
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What is the number of wavelengths that pass a given point each second called?

User Bhargav Patel
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Since waves are moving, we define frequency as the number of waves that pass a given point in a specified unit of time. The unit commonly used is Hertz which is the number of wave cycles that pass a point in one second.
User Yuming Cao
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