The concept of electromagnetic waves

Electromagnetic waves are a type of energy. Any object with a temperature higher than absolute zero will emit electromagnetic waves. And the higher the temperature, the shorter the wavelength of the electromagnetic waves emitted. Just as people have been living in the air but cannot see the air with their eyes, in addition to light waves, people cannot see the ubiquitous electromagnetic waves.
Electromagnetic waves are a form of motion of electromagnetic fields. Electricity and magnetism can be said to be two sides of the same coin. A changing electric field will produce a magnetic field (that is, current will produce a magnetic field), and a changing magnetic field will produce an electric field. The changing electric field and the changing magnetic field constitute an inseparable unified field, which is the electromagnetic field. The propagation of the changing electromagnetic field in space forms electromagnetic waves. The changes in electromagnetism are like the gentle breeze blowing on the water surface to generate water waves, so it is called Electromagnetic waves are also often called radio waves.

The concept of electromagnetic wave frequency

The frequency of an electromagnetic wave refers to the number of times a specific electromagnetic wave passes through per second. It is the ratio of the speed of a specific electromagnetic wave to its arc length. The frequency of electromagnetic waves can be expressed in Hertz (Hz), which indicates how many electromagnetic waves pass through that point per second.
Electromagnetic waves can be of various types, such as visible light, infrared rays, ultraviolet rays, microwaves, ultrasonic waves, radio waves, etc. Each electromagnetic wave has its own specific frequency. Therefore, the frequency of electromagnetic waves can be used to represent different electromagnetic waves and also indicate the differences and similarities between them.