LIGHT WAVES Subtitle

What is Light? Light is a type of energy that travels as waves. Thing like a candle or fish that live in the ocean produce light. Compared to other types of waves, light waves are different. For example, sound waves must travel through matter, while light waves don’t. For that reason, light is an electromagnetic wave.

Electromagnetic Waves Electromagnetic waves have 2 parts. These 2 parts are made up of changing electric and magnetic fields. When an electrically charged particle vibrates, it disturbs the electric and magnetic fields around it. And by that happening, these 2 vibrating fields produce electromagnetic waves (EM) These fields are perpendicular to each other and carry away the charged particle, and because they exist an empty space, they don’t need a medium in which to travel.

Electromagnetic Spectrum When looking around you, light reflects in you eyes. Light that we already see is called visible light But if a bee was in the room, it would be seeing another type of light, in which we call ultraviolet light (that you cant see) Both of these types of light are part of larger range of waves called the electromagnetic spectrum The EM spectrum is composed of different types of waves which include x-rays, microwaves, and radio waves, all in which have different frequencies.

Speed of Light In a vacuum, all EM waves, including light, move at the same speed which is 300,000,000 m/s. This is called the speed of light, which is constant (will form a straight line in a graph) And although EM waves don’t need a medium to travel to, they can travel through many other materials When they do, they travel more slowly than they do in a vacuum.

Energy and Frequency EM waves depend on the wave’s energy to determine which energy it should use. High-frequency, short-wavelength EM waves have more energy than low- frequency, long-wavelength waves. The more energy EM waves have, the more dangerous they can be.

Light Waves and Color Light waves are usually invisible for us because their wave lengths are either too short or too long for our eyes to see However, when we do see visible light that have wavelengths that appeal to our sight, we see such a thing called color. Depending on the wavelength and the frequency of the light, we could see different colors

Light Waves and Color White light is what we perceive when our eyes detect all wavelengths of visible light at once in equal proportions And as we said, The wavelength and frequency of light usually determines its color. The shortest wavelengths of light are seen as violet, while the longest wavelengths are seen as red. Fun Fact: The night sky is actually red, but because there isn’t a good source of light and the red wavelengths aren’t visible, we see it as black.

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