How does, introducing a frequency to an organism with like-frequency, destroy that organism?
When the frequency applied is at the same frequency of the organism, it sets up a resonance that kills it. I like to think of it like the Tacoma Narrows Bridge when the wind was at the same frequency, it began to vibrate violently and finally broke up. Much the same as a soprano hitting a note that resonates with the wine glass and it breaks. Same idea.