Hello, I'm new to the forum, and Physics is not my area of study, but I have a doubt that I couldn't find a satisfactory answer on Google, so I created this account in this forum just to ask this, because I'm really curious to know the answer to this doubt. Does "wave–particle duality" exist in low frequency waves? For example, the electromagnetic radiation used in the "long-wave" radio AM broadcast, can "manifest" this wave–particle duality? Or the Extremely low frequency (ELF) radio waves, with frequencies from 3 to 30 Hz, do they manifest wave–particle duality as well? In other words, my doubt is: is there a minimum frequency of electromagnetic radiation for the "particle behavior" to be possible to be experimentaly detected? I could also extend the question and ask if there is a maximum frequency of electromagnetic radiation for it to be capable of behaving like a particle? Thanks.