Radio waves (formerly called Hertzian waves) are a type of electromagnetic radiation with the lowest frequencies and the longest wavelengths in the electromagnetic spectrum, typically with frequencies below 300 gigahertz (GHz) and wavelengths greater than 1 millimeter (3⁄64 inch), about the diameter of a grain of rice.

2025年1月10日 · radio wave, wave from the portion of the electromagnetic spectrum at lower frequencies than microwaves. The wavelengths of radio waves range from thousands of metres to 30 cm. These correspond to frequencies as low as 3 Hz and as high as 1 gigahertz (10 9 Hz).

2024年2月4日 · The formula which gives the relation between the speed, wavelength, and frequency of the radio waves is discussed below, v r = λv. where, v r is the speed, λ is the wavelength, and; v is the frequency of the radio wave. The concept of radio waves is explained by their speed formula.

Radio waves are the waves that are a sort of electromagnetic radiation and have a recurrence with the longest frequency of radio waves from high 300 GHz to low as 3 kHz; however, someplace it is characterized as over 3 GHz as microwaves. At 300 GHz, the frequency of radio waves is 1 mm, and at 3 kHz is 100 km.

Electromagnetic waves in this frequency range, called radio waves, are widely used in modern technology, particularly in telecommunication.

These are the frequencies at which energy from an oscillating current can radiate off a conductor into space as radio waves, so they are used in radio technology, among other uses. Different sources specify different upper and lower bounds for the frequency range.

2025年2月12日 · Radio waves are used for wireless transmission of sound messages, or information, for communication, as well as for maritime and aircraft navigation. The information is imposed on the electromagnetic carrier wave as amplitude modulation (AM) or as frequency modulation (FM) or in digital form (pulse modulation).

2016年8月10日 · You can tune a radio to a specific wavelength—or frequency—and listen to your favorite music. The radio "receives" these electromagnetic radio waves and converts them to mechanical vibrations in the speaker to create the sound waves you can hear. Astronomical objects that have a changing magnetic field can produce radio waves.

2016年3月26日 · Radio waves oscillate at frequencies between the upper end of human hearing at about 20 kilohertz, or kHz (kilo is the metric abbreviation meaning 1,000), on up to 1,000 gigahertz, or GHz (giga is the metric abbreviation meaning 1 billion).

4 天之前 · In the electromagnetic spectrum, low-frequency waves like radio waves have lower energy, while high-frequency waves like X-rays and gamma rays have higher energy. For example, visible light has a frequency range of approximately 4×10144 \times 10^{14} Hz (red) to 7.5×10147.5 \times 10^{14} Hz (violet).