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morningstar
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Do electromagnetic waves expand as they travel across the cosmos? e.g. Do the wavelengths of emitted light, from distant galaxies, have longer wavelengths when they reach Earth than they did when they were emitted?
Electromagnetic waves are a form of energy that is created when an electric field and a magnetic field interact with each other. These waves are able to travel through space and carry energy from one place to another.
Electromagnetic waves have many different characteristics, including wavelength, frequency, and amplitude. They also have the ability to travel through a vacuum, which means they can travel through space.
Electromagnetic waves travel through the cosmos at the speed of light, which is about 299,792,458 meters per second. They are able to travel through the vacuum of space because they do not need a medium to travel through.
The wavelength and frequency of electromagnetic waves are inversely proportional. This means that as the wavelength increases, the frequency decreases, and vice versa. This relationship is described by the equation c = λν, where c is the speed of light, λ is the wavelength, and ν is the frequency.
Electromagnetic waves can interact with matter in different ways, depending on the type of matter and the frequency of the wave. Some waves, such as radio waves and microwaves, can be absorbed and converted into heat energy by matter. Other waves, like visible light, can be reflected, transmitted, or refracted by matter.