Relationship between say an opening and the wavelength

[rmarkatos]

I just have a basic question about waves and diffraction because i am not really clear on that part.

What is the relationship between say an opening and the wavelength. For example i am not sure if there is a smaller opening with a large wavelegnth, will a lot of diffraction occur.

 

[Ja4Coltrane]

With my limited knowledge I can tell you this much: longer wavelengths cause more diffraction. This is why AM often works better around hills and such than FM--AM has longer wavelength. As for the size of the hole, I don't know for sure but I think that that is not very important--don't trust me for sure though.