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- This happens when an electron interacts with a light wave, but because the light wave is an oscillating field the electron moves to and fro and there is no net motion. If you could watch an electron as light passes by you'd see it start oscillating to and fro, but it's net position wouldn't change. This is exactly what happens in your TV aerial.
Mar 31, 2015 · In light propagation, oscillation does not mean any movement in space. It is the value of the electromagnetic field, at one given point in space, that oscillates. The picture that you quote does not represent the movement in space, but the electromagnetic field value as a function of time.
- electromagnetism
Here is the simple explanation as to why electromagnetic...
- electromagnetism
Here is the simple explanation as to why electromagnetic waves oscillate. As you probably already know, electromagnetic waves are generated by moving electrons. An electron generates an electric field.
This is exactly what happens in your TV aerial. The light (i.e. radio frequency EM) causes electrons in the TV aerial to oscillate and this oscillation generates an oscillating electric current. The voltage this generates is amplified by your TV.
Assuming we have a beam of light traveling from left to right, the electric field of the wave can be illustrated as a sine wave that oscillates up and down in space. But the thing that oscillates is not an object or photon or anything physical, it's just the value of the electric field.
Jul 16, 2018 · Electromagnetic waves, like all waves, carry energy (see Everything You Need to Know About Oscillations & Waves); plants and photosynthetic algae make their way in the world by capturing a vanishingly small fraction of this energy as chemical energy. This process makes life as we know it possible.
Electromagnetic Wave: Electromagnetic waves are a self-propagating transverse wave of oscillating electric and magnetic fields. The direction of the electric field is indicated in blue, the magnetic field in red, and the wave propagates in the positive x-direction.
We know that light is a wave based on how it behaves – it exhibits the same properties of other waves we have examined – it interferes with itself, it follows an inverse-square law for intensity (brightness), and so on.
