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Thread: Question about frequency?

  1. #1 Question about frequency? 
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    Is frequency the number of oscillations every second or the number of wave crests that pass every second?


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    Quote Originally Posted by Muon321 View Post
    Is frequency the number of oscillations every second or the number of wave crests that pass every second?
    It's the number of whole cycles per second.


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    Quote Originally Posted by Muon321 View Post
    Is frequency the number of oscillations every second or the number of wave crests that pass every second?
    Those sound like two different descriptions of the same thing; i.e. frequency.
    Without wishing to overstate my case, everything in the observable universe definitely has its origins in Northamptonshire -- Alan Moore
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    If the wave is a pure sine, it is the same thing. But the wave form may be more complex. For instance
    . This wave constains an harmonic 3.
    This wave form has two positive crests (and two negative) for each period. The frequency is the number of period by second, i.e. f, although the number of positive crest is the double.
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    Brassica oleracea Strange's Avatar
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    Although, strictly speaking, that is two frequencies.
    Without wishing to overstate my case, everything in the observable universe definitely has its origins in Northamptonshire -- Alan Moore
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    In my opinion, it is better to consider that the basic notion is the period : a function is periodic, of period T if . Once you have the period T, the frequency is a mere consequence : .
    Natural waves, like sounds, are generally not pure sine but contain many harmonics. I was told that violins have significant harmonics up to the 17th.
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