频率基础

频率是重复事件单位时间内发生的次数。在物理学中，它用于描述振荡和波，如声音、光和交流电。

介绍

Frequency is a measure of how often a periodic phenomenon occurs over time. From sound waves to radio signals, from mechanical vibrations to electromagnetic radiation, frequency is essential for understanding oscillatory behavior in nature and technology.

历史

The concept of frequency emerged with the study of periodic phenomena. Heinrich Hertz's work on electromagnetic waves in the 1880s led to the hertz being adopted as the SI unit of frequency in his honor. The understanding of frequency became crucial with the development of radio, electronics, and quantum mechanics.

关键单位

Hertz (Hz)

The SI unit of frequency, equal to one cycle per second.

Kilohertz (kHz)

Equal to 1,000 Hz, commonly used for audio frequencies and AM radio.

Megahertz (MHz)

Equal to 1,000,000 Hz, used for FM radio, television, and computer processors.

Gigahertz (GHz)

Equal to 1,000,000,000 Hz, used for microwave communications and modern computer processors.

Terahertz (THz)

Equal to 1,000,000,000,000 Hz, used in advanced scientific applications and emerging technologies.

应用

  • Radio and television broadcasting systems
  • Computer processor and memory specifications
  • Audio equipment and sound engineering
  • Medical imaging and therapeutic devices
  • Wireless communication and networking
  • Scientific research and spectroscopy

Frequency Relationships

f = 1/T = v/λ

Frequency equals the reciprocal of period (T), or wave velocity (v) divided by wavelength (λ).