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In [[physics]], '''resonance'''  is the tendency of a system to oscillate at its maximum amplitude, associated with specific [[Frequency|frequencies]] known as the system's ''resonance frequencies'' (or ''resonant frequencies'').  At these frequencies, even small periodic driving forces can produce large amplitude vibrations, because the system stores vibrational [[energy]].  When damping is small, the resonance frequency is approximately equal to the natural frequency of the system, which is the frequency of free vibrations.  Resonant [[phenomena]] occur with all types of vibrations or waves: there is mechanical resonance, acoustic resonance, electromagnetic resonance, nuclear magnetic resonance (NMR), Electron paramagnetic resonance (ESR) and resonance of [[quantum]] wave functions. Resonant systems can be used to generate vibrations of a specific frequency, or pick out specific frequencies from a complex vibration containing many frequencies.

In [[physics]], '''resonance'''  is the tendency of a system to oscillate at its maximum amplitude, associated with specific [[Frequency|frequencies]] known as the system's ''resonance frequencies'' (or ''resonant frequencies'').  At these frequencies, even small periodic driving forces can produce large amplitude vibrations, because the system stores vibrational [[energy]].  When damping is small, the resonance frequency is approximately equal to the natural frequency of the system, which is the frequency of free vibrations.  Resonant [[phenomena]] occur with all types of vibrations or waves: there is mechanical resonance, acoustic resonance, electromagnetic resonance, nuclear magnetic resonance (NMR), Electron paramagnetic resonance (ESR) and resonance of [[quantum]] wave functions. Resonant systems can be used to generate vibrations of a specific frequency, or pick out specific frequencies from a complex vibration containing many frequencies.