# Wave interference

Hi,

I was wondering if two waves, whom both have the same frequency and wave, could be combined together in a constructive interference way, even if they did not have the same amplitude?

Doc Al
Mentor
Sure, why not?

Well, my book made it seem as though constructive waves could be formed when the amplitude, frequency, and wavelength are the same. Thank you, by the way, for your prompt reply.

Doc Al
Mentor
Well, my book made it seem as though constructive waves could be formed when the amplitude, frequency, and wavelength are the same.
Well, the part about needing the same amplitude is not true for constructive interference. Now, to get completely destructive interference you do need the same amplitude, otherwise the out of phase waves would not completely cancel each other.

olivermsun
$$\cos \omega t + 3 \cos \omega t = ?$$