Vibrations are calculated in terms of hertz. The hearing range of infants ranges from 20 hertz to 20,000 hertz and for an adult human, the frequency of hearing differs from 20 Hz to 16,000 Hz. Also, the frequency range of ultrasound and infrasound are denoted with femto hertz and terahertz.

Oscillations of the perpendicular electric field and magnetic field in electromagnetic radiation are measured in terms of megahertz and gigahertz.

Radiofrequency radiation measurements are made in kilohertz, megahertz or gigahertz

The frequency of light is measured in thousands of terahertz.

In central processing units (CPU) of computers, the clock rate is given in the terms of megahertz or gigahertz. In the year 1970, for PC’s, the clock rate of CPU ranges approximately 1 MHz.