Extremely low frequency (ELF) is the ITU designation for electromagnetic radiation (radio waves) with frequencies from 3 to 30 Hz , and corresponding wavelengths of 100,000 to 10,000 kilometers, respectively. In atmospheric science, an alternative definition is usually given, from 3 Hz to 3 kHz.
Read moreIs low or high frequency dangerous?
So the power delivered by a low frequency radiation comes in a great number of small packets, while the same amount of power carried by an higher frequency radiations is composed by few large packets. This is the reason why high frequency radiation is more harmful than lower frequency radiation .
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