A frequence range or frequency band is a range of wave frequencies. It most often refers to either a range of frequencies in sound or a range of frequencies in electromagnetic radiation, which includes light and radio waves. A wave is a disturbance that propagates through space or spacetime, often transferring energy. ... It has been suggested that this article be split into articles entitled Sound, Sound pressure and Sound pressure level, accessible from a disambiguation page. ... Electromagnetic radiation can be imagined as a self-propagating transverse oscillating wave of electric and magnetic fields. ...
Many radio devices operate within a specified frequency range which limits the frequencies on which it is allowed to transmit. The lower-bound and upper-bound frequencies are the points at which signal strength of the device falls off by 3dB.
A method of producing amorphous alloy thin strip suitable for use in commercial frequencyband transformers utilizes a high-quality molten steel suitable for electromagnetic silicon steel plates but containing insufficient silicon and boron.
The strip is highly useful for commercial frequencyband transformers which typically have operating frequencies of 50Hz and 60Hz.
Thus, to use it to make an amorphous alloy for commercial frequencyband transformers, it is necessary to add silicon and boron to the molten steel.
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