[P5.4]
is: the frequency that a simple harmonic oscillator has if it is neither damped nor driven. [P5.2, P5.3, P5.4]
is exemplified: by an electrical oscillator, in which the charge (and the current) have a natural frequency [P5.4]
is exemplified: by a mechanical oscillator, in which the oscillating mass 
has a natural frequency 
where 
is the spring constant. [P5.2]
Copyright 1997, The Open University