First, I am sorry for very unspecific topic, but I really have no clue what I am looking for. I need some way how in mathematical terms describe things like following:(adsbygoogle = window.adsbygoogle || []).push({});

I have line segment of length [itex]l[/itex] and I have sine function with period length [itex]\lambda[/itex] originating at one end of line segment. If [itex]l[/itex]=[itex]\lambda[/itex] I can easily count that there will be three points on the segment where sine value will be 0. But If [itex]\lambda[/itex] is slightly shorter there still will be three such points until [itex]l=\frac{3}{2}\lambda[/itex]. Then there will be four of them. How can I describe number of such points as [itex]f(l,\lambda)[/itex]?

What should I look for/study? Frankly I wouldn't be surprised if it is something really basic, because I tend to miss basic things :/ Thank you in advance

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# What function or operation am I looking for?

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