# What is electromagnwetic wave

Hello
Whatr is electromagnetic wave

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Hi John
What a question. This is a subject all on its own. I think far too complex for this forum. Although there may be simple ways to explain it they probably will never be complete and leave one with more questions.

Google âelectromagnetic waveâ and you will get lots of results. The Wikipedia entry looks pretty complete and is quite a large entry. I only had a quick look at it and it is quite complex but you will see what I mean when I said it is a study in itself.

I am afraid I am one of those who knows just enough to be dangerous. That is I have a good idea of what it is and does and its uses but leave all the nitty gritty details to the experts and just believe them. There are people who do nothing else but study this sort of thing.
Cheers Bob

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Further to what @Robert93820 said, here are some examples of electromagnetic waves/radiation (they are the same thing, but radiation is a bit of a loaded term), starting at low frequency going up to high:

thereâs also a lot of good information here :Anatomy of an Electromagnetic Wave | Science Mission Directorate

Essentially the âwaveâ is a combination of an electric field and a magnetic field, as the electric field decreases in strength the magnetic field increases, then it swaps. To make matters more confusing itâs a wave, but itâs also a particle: a photon. The wave view of it is useful when looking at the frequency.

Thereâs a lot of fear mongering around them and a lot of bogus products: e.g. peopleare scared about the emf radiation from wifi so people sell products to block it, however if the products worked, then the wifi wouldnât, so youâd be better off just turning off the wifi router. The same with the stickers people put on their phones to block the ratiation, if the stickers worked, the phone wouldnât.

AnywayâŚ they are everywhere, we use them to see (light) transmit data (radio, wifi, mobile phonesâŚ) heat things (microwave), in medicine (x-rays, gamma-rays). Iâm not sure if Iâve helped.

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Well said, Doug. Generally, wave theory is the introduction to electromagnetic properties of light. The wave theory could not explain the quantum effects. It all started with the photoelectric effect. A concise explanation is in Wiki.

Good concept, Robert. Just like water and fire. Know its power and treat with respect.

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