Preferably, the frequency is greater than 100 hertz, more preferably the frequency is approximately 150 hertz.

Lights flash at frequency f = 0.5 Hz (Hz = hertz), 1.0 Hz and 2.0 Hz, where x {\displaystyle x} Hz means x {\displaystyle x} flashes per second.

For example, the odd harmonics of a 4 Hertz (Hz) square wave would be 12 Hz , 20 Hz, 28 Hz, etc. right up into the radio frequency range.

For example, the odd harmonics of a 4 Hertz (Hz) square wave would be 12 Hz , 20 Hz, 28 Hz, etc. right up into the radio frequency range.

Multiples of this unit in common use are Kilohertz (KHz = 103 Hz), Megahertz (MHz = 106 Hz), Gigahertz (GHz = 109Hz)

The following are twelve commonly tested frequency ranges: 125 Hz, 250 Hz, 750 Hz, 1000 Hz, 1500 Hz, 2000 Hz, 3000 Hz, 4000 Hz, 5000 Hz, 6000 Hz, 8000Hz, and 10,000 Hz.

A first frequency is preferably comprised between 7 Hz and 20 Hz or between 40 Hz and 120 Hz, whereas the second frequency is set between 2 Hz and 3 Hz or between 5 Hz and 7 Hz.

Thus, the refresh rate is changed in stages from 60Hz through the sequence of 30Hz, 20Hz, 15Hz, 12Hz, and 10Hz to 7.5Hz.

HZ and HZ' are organic or mineral acids.

100 (± 1 %) Volts AC, 50 Hz (± 1 %)/60 Hz (± 1 %