Hertz
German physicist who proved electromagnetic waves exist.
The hertz (symbol: Hz) is the unit of frequency in the International System of Units (SI), defined as one periodic event per second.
- field
- Physics (electromagnetism)
- nationality
- German
- known_for
- Conclusive proof of the existence of electromagnetic waves; namesake of the hertz unit
Lore & Background
His work laid the foundation for radio, television, and modern wireless communication.
Reader's Guide
The hertz is fundamental to describing periodic phenomena across science and technology. The unit also appears in the Planck relation E = hν, linking frequency to photon energy. Its adoption standardized frequency measurement, replacing the earlier 'cycles per second' in the late 1960s popular press. Common multiples include kilohertz (10³ Hz), megahertz (10⁶ Hz), gigahertz (10⁹ Hz), and terahertz (10¹² Hz). The unit's legacy endures in every device that relies on periodic signals, from musical instruments to spacecraft.
Did You Know?
- One hertz is equivalent to one periodic event per second, and the unit replaced 'cycles per second' in 1960.
- The hertz is used for periodic events only; aperiodic events use reciprocal seconds or becquerels for radioactivity.
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