There is no such thing as a "unit of electromagnetic". There are several units related to electricity, electromagnetic waves, etc., depending on exactly what aspect you want to measure. For example, in the case of electricity, there are units for voltage, current, intensity, power, frequency, and others.
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Answer: Meters
Answer: A wavelength is a length, so the official SI unit would be the meter. SI prefixes can be used - thus, such wavelengths might be measured in kilometers, meters, micrometers (= microns), nanometers, etc.
The shorter the wavelength of electromagnetic radiation, the higher its energy. Therefore, gamma rays, which have the shortest wavelength, carry the most energy.
Gamma rays have the most energy in the electromagnetic spectrum. They have the shortest wavelength and highest frequency, making them the most energetic form of electromagnetic radiation.
Gamma rays have the shortest wavelength out of radio waves, infrared waves, X-rays, ultraviolet light, and gamma rays. They are high-energy photons with extremely short wavelengths, making them the most energetic form of electromagnetic radiation.
The electromagnetic spectrum is divided into various regions based on wavelength or frequency. From longest to shortest wavelength, the divisions are radio waves, microwaves, infrared, visible light, ultraviolet, X-rays, and gamma rays. Each region has specific properties and uses in terms of communication, technology, and research.
electromagnetic waves don't actually have a color. they flash white light when they interact with another object just like lightning.