A unit of frequency in the International System of Units (SI), equal to one million cycles per second. It is most commonly used to measure the transmission speeds of electronic devices, the frequency of radio signals, and the clock speeds of microprocessors.
Key Specifications
The hertz (symbol: Hz) is the unit of frequency in the International System of Units (SI), often described as being equivalent to one event (or cycle) per second. The hertz is an SI derived unit whose formal expression in terms of SI base units is 1/s or s−1, meaning that one hertz is one per second or the reciprocal of one second. It is used only in the case of periodic events. It is named after Heinrich Rudolf Hertz (1857-1894), the first person to provide conclusive proof of the existence of electromagnetic waves. For high frequencies, the unit is commonly expressed in multiples: kilohertz (kHz), megahertz (MHz), gigahertz (GHz), terahertz (THz). Some of the unit's most common uses are in the description of periodic waveforms and musical tones, particularly those used in radio- and audio-related applications. It is also used to describe the clock speeds at which computers and other electronic devices operate.
- Symbol: MHz
- Base Unit: 1 MHz = 1,000,000 Hz (Hertz)
- Dimensions: Time to the -1 power (inverse time)
- Relationship: 1,000 kHz < 1 MHz < 0.001 GHz
Common Applications
Computing
Historically used to measure the clock speed of CPUs. While modern processors have moved into the gigahertz (GHz) range, MHz is still the standard for measuring RAM (Random Access Memory) speeds and bus frequencies.
Telecommunications
Used to define bands within the radio spectrum. For example, FM radio broadcasts typically operate between 88 MHz and 108 MHz.
Physics
Used in Magnetic Resonance Imaging (MRI) to describe the precession frequency of atomic nuclei in a magnetic field.
Contextual Comparison
In the context of data transfer, a higher MHz rating generally indicates a higher bandwidth, the capacity to carry data, but not necessarily the absolute speed, as other factors like latency and architecture play a role.
Table: MHz Comparison
| Unit | Value in Hz |
| 1 MHz | 1,000,000 Hz |
| 100 MHz | 100,000,000 Hz |
| 1 GHz | 1,000,000,000 Hz |
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