I study physics I’m in the first year of university and I don’t understand why in the graph the cos part is like that when you draw the interference
In: Physics
I feel like you are referring to a specific example from a textbook or something. I can’t help you with a specific graph if I can’t see it.
Unfortunately there isn’t much to explain here. Beat frequency are a result of the superposition of waves. Superposition is basically a fancy word for add. So if you add 2 waves with very similar frequencies (it doesn’t matter if it is sine or cosine), you will get a beat frequency.
I think what you are confused about is that **the beat frequency is the frequency of change in amplitude** of the superimposed waves, not the frequency of the wave itself
Check out this link to actually hear what I am talking about: [https://ophysics.com/waves10.html](https://ophysics.com/waves10.html)
The tone you hear is the frequency of the wave. The “wah-wah-wah-wah” is the beat frequency and it is the changing of the amplitude of the wave.
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