I need to know about: low frequency electromagnetic waves in lower stages than radio waves. Here is picture of the region I'm interested in
What can you say about frequency of power cables in this range? What about electromagnetic waves of power cables? How harmful they are? What function they do?
According new picture I have found there are more things in lower frequency than radio waves.
Power lines are in range <100kHz
Strong magnets, MRI are in range 0Hz