Hertz: Difference between revisions
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Created page with "= Hertz = Category:Units of Measurement Has topic type::Scientific Unit Instance of::Frequency Unit Related concept::Frequency Related concept::Pitch {{#set: |Definition=Hertz (Hz) is the SI unit of frequency, representing one cycle per second. }} '''Hertz''' (symbol: '''Hz''') is the **unit of measurement for frequency** in the International System of Units (SI). It indicates how many cycles (oscillations) occur in one second. == Examples == * A..." |
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[[Related concept::Frequency]] | [[Related concept::Frequency]] | ||
[[Related concept::Pitch]] | [[Related concept::Pitch]] | ||
[[Related concept::Heinrich Hertz]] | |||
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'''Hertz''' (symbol: '''Hz''') is the **unit of | '''Hertz''' (symbol: '''Hz''') is the **unit of frequency** in the International System of Units (SI). It represents **one cycle per second**. | ||
== | == Use in Music == | ||
* A₄ = 440 Hz | * Tuning note A₄ = 440 Hz (vibrates 440 times per second) | ||
* | * Describes the frequency content of sound | ||
* Used in equalization, tuning systems, synthesis, and signal processing | |||
== Human Hearing Range == | |||
Humans can typically hear between: | |||
* **20 Hz** (low bass) and | |||
* **20,000 Hz (20 kHz)** (high treble) | |||
== Historical Background == | |||
The unit is named after **Heinrich Rudolf Hertz** (1857–1894), a German physicist who first conclusively proved the existence of electromagnetic waves predicted by James Clerk Maxwell. | |||
In 1930, the "hertz" replaced the earlier term **"cycles per second" (cps)** as part of a movement to standardize scientific units. It was officially adopted as an SI unit in **1960** by the **11th General Conference on Weights and Measures** (CGPM). | |||
== | == Heinrich Hertz == | ||
* | * Born: 22 February 1857, Hamburg, Germany | ||
* | * Died: 1 January 1894, Bonn, Germany (aged 36) | ||
* | * Contributions: Proved the wave nature of light and radio; confirmed Maxwell's theories | ||
* Legacy: The hertz (Hz), the SI unit of frequency, is named in his honor | |||
== See also == | == See also == | ||
| Line 25: | Line 38: | ||
* [[Pitch]] | * [[Pitch]] | ||
* [[Sound Wave]] | * [[Sound Wave]] | ||
== Sources == | |||
* Wikipedia contributors. “Hertz (unit).” [https://en.wikipedia.org/wiki/Hertz Wikipedia – Hertz], last updated 2024-03 | |||
* Wikipedia contributors. “Heinrich Hertz.” [https://en.wikipedia.org/wiki/Heinrich_Hertz Wikipedia – Heinrich Hertz], last updated 2024-04 | |||
* International Bureau of Weights and Measures (BIPM). “SI Brochure, 9th edition.” [https://www.bipm.org/] | |||
* National Institute of Standards and Technology (NIST). “SI Base Units.” [https://www.nist.gov/] | |||
Revision as of 21:12, 14 May 2025
Hertz
Scientific Unit Frequency Unit Frequency Pitch Heinrich Hertz
Hertz (symbol: Hz) is the **unit of frequency** in the International System of Units (SI). It represents **one cycle per second**.
Use in Music
- Tuning note A₄ = 440 Hz (vibrates 440 times per second)
- Describes the frequency content of sound
- Used in equalization, tuning systems, synthesis, and signal processing
Human Hearing Range
Humans can typically hear between:
- **20 Hz** (low bass) and
- **20,000 Hz (20 kHz)** (high treble)
Historical Background
The unit is named after **Heinrich Rudolf Hertz** (1857–1894), a German physicist who first conclusively proved the existence of electromagnetic waves predicted by James Clerk Maxwell.
In 1930, the "hertz" replaced the earlier term **"cycles per second" (cps)** as part of a movement to standardize scientific units. It was officially adopted as an SI unit in **1960** by the **11th General Conference on Weights and Measures** (CGPM).
Heinrich Hertz
- Born: 22 February 1857, Hamburg, Germany
- Died: 1 January 1894, Bonn, Germany (aged 36)
- Contributions: Proved the wave nature of light and radio; confirmed Maxwell's theories
- Legacy: The hertz (Hz), the SI unit of frequency, is named in his honor
See also
Sources
- Wikipedia contributors. “Hertz (unit).” Wikipedia – Hertz, last updated 2024-03
- Wikipedia contributors. “Heinrich Hertz.” Wikipedia – Heinrich Hertz, last updated 2024-04
- International Bureau of Weights and Measures (BIPM). “SI Brochure, 9th edition.” [1]
- National Institute of Standards and Technology (NIST). “SI Base Units.” [2]