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What are electromanetic waves and why are they called as such?

How are EM waves produced?

How are EM waves propagated and transmitted?

How do electromagnetic waves differ from mechanical waves?

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Sagot :

Answer:

The waves of energy are called electromagnetic (EM) because they have oscillating electric and magnetic fields. ... If it has low frequency, it has less energy and could be a TV or radio wave. All EM energy waves travel at the speed of light. No matter what their frequency or wavelength, they always move at the same speed.

Electromagnetic waves are created by oscillating charges (which radiate whenever accelerated) and have the same frequency as the oscillation. Since the electric and magnetic fields in most electromagnetic waves are perpendicular to the direction in which the wave moves, it is ordinarily a transverse wave.

The Dipole Antenna

The oscillating current creates oscillating electric (E) and magnetic (H) fields which in turn generate more electric and magnetic fields. Thus a outward propagating electromagnetic wave is created.

Electromagnetic waves differ from mechanical waves in that they do not require a medium to propagate. This means that electromagnetic waves can travel not only through air and solid materials, but also through the vacuum of space.

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