Frequency (Hertz)
Definition
The number of complete wave cycles per second, measured in Hertz (Hz). 1 Hz = 1 cycle per second.
Why is Frequency (Hertz) Important?
Frequency (Hertz) is a core physics concept that describes the fundamental behavior of matter and energy. Understanding this principle enables engineers, students, and scientists to design better systems, solve real-world problems, and predict physical phenomena with precision.
Our physics calculators make it easy to compute values related to this concept, bridging the gap between theoretical understanding and practical application in engineering, education, and research.
What is Frequency?
Frequency is the number of complete cycles of a periodic event per second, measured in Hertz (Hz). 1 Hz = 1 cycle per second. Frequency applies to sound waves, electromagnetic radiation, electrical signals, mechanical vibrations, and any repeating phenomenon.
Frequency Units
| Unit | Value | Example |
|---|---|---|
| 1 Hz | 1 cycle/second | Heartbeat at rest |
| 1 kHz | 1,000 Hz | Audio tones |
| 1 MHz | 1,000,000 Hz | AM radio stations |
| 1 GHz | 10โน Hz | Computer processors, WiFi |
| 1 THz | 10ยนยฒ Hz | Infrared light, security scanners |
Frequency Examples
| Sound/Signal | Frequency |
|---|---|
| Human hearing range | 20 Hz โ 20,000 Hz |
| Bass notes | 20โ250 Hz |
| Middle C (piano) | 261.6 Hz |
| Concert A (tuning standard) | 440 Hz |
| Human speech range | 85โ8,000 Hz |
| Dog hearing (upper limit) | ~65,000 Hz |
| US power grid | 60 Hz |
| European power grid | 50 Hz |
| WiFi (2.4 GHz band) | 2,400,000,000 Hz |
| 5G (mmWave) | 24โ100 GHz |