What is non-ionising radiation?
Non-ionising radiation is found at the long wavelength end of the electromagnetic spectrum and may have enough energy to excite molecules and atoms causing then to vibrate faster. This is very obvious in a microwave oven where the radiation causes water molecules to vibrate faster creating heat. Non-ionizing radiation ranges from extremely low frequency radiation, and includes the radio frequency, microwave, and visible portions of the spectrum into the ultraviolet range. Extremely low-frequency radiation has very long wavelengths (in the order of a thousand kilometres or more) and frequencies in the range of 100 hertz or less. Radio frequencies have wavelengths of between 1 and 100 metres and frequencies in the range of 1 million to 100 million hertz. Microwaves that we use to heat food have wavelengths that are a few centimetres long and have frequencies of about 10 thousand million hertz.
