How are EMFs different from other types of electromagnetic energy?
X-rays, visible light, microwaves, radio waves, and EMFs are all forms of electromagnetic energy. One property that distinguishes different forms of electromagnetic energy is the frequency, expressed in hertz (Hz). Just as various chemicals affect our bodies in different ways, various forms of electromagnetic energy can have very different biological effects (see the Biological Studies section). Some types of equipment or operations simultaneously produce electromagnetic energy of different frequencies. Welding operations, for example, can produce electro-magnetic energy in the ultraviolet, visible, infrared, and radio frequency range, in addition to power-frequency EMFs. Microwave ovens produce 60-Hz fields of several hundred milligauss, but they also create microwave energy inside the appliance that is at a much higher frequency (about 2.45 billion Hz). We are shielded from the higher frequency fields by the casing of the oven, but we are not shielded from the 60-Hz fields. This book
