Light - Lanier Bureau of Investigation

Radio waves Microwaves Infrared waves Light Visible light

Gamma Rays Ultraviolet X-ray Light Rays Light is composed of changing electric and magnetic

fields running perpendicular to each other. Light does not have to travel through a medium; so it is not a mechanical wave. It is an electro-magnetic wave. Light fields Light exerts a field. A field is region around an object that can exert a force to push or pull on an object.

Even though the sun shines millions of miles away, its light field extends all the way to Earth and beyond or we would not be able to see the planets in our galaxy. Flashlights

have light fields that extend in front of the bulb. Speed of Light Speed of light. 300,000,000 m/s. Light travels

faster in space and slightly slower in matter. (1) True or (2) False 1. Light waves are called electromagnetic waves. 2. Light waves need a medium. 3. A field is region around an object that can exert a force to push or pull on an object.

4. The sun is an example of a light field. 5. Light travels faster than sound Wavelength determines the type of wave and what it can do. Longest waves (but least frequent) are radio waves. These include the

light waves used for radio, television broadcasting, radar, computer applications, etc. Microwaves Not as long as radio waves

but more frequent, microwaves can be used to cook as well as satellite communication. Infrared Light Infrared light has shorter wavelengths than microwaves but are even more frequent. They

are used in photography, tracking and keeping food warm. 1) Radio waves 2) Microwaves 3) Infrared waves a. These have shorter wavelengths than radio waves & can be used in satellite communication. b. These waves have the highest frequency but

shortest wavelength of the three listed above. c. These include television broadcasting waves. d. These waves have the longest wavelengths but the shortest frequency of ALL electromagnetic waves. Visible Light Spectrum Spectrum means a group of items that gradually change from one extreme to

another. The visible light spectrum is the light we can actually see. ROY G BIV : red, orange, yellow, green, blue, indigo and violet From longest to shortest wavelength Ultraviolet Light Though it has shorter wavelengths than visible

light, ultraviolet light has a higher frequency. The sun gives off UV light which can burn human skin and many florescent lights can emit UV lights. X-rays Due to short wavelengths but high frequency, x-rays can penetrate solid objects. As a result

it has been used for years in diagnosing internal injuries such as broken bones. Gamma Rays The fastest but the shortest light waves, Gamma Rays can penetrate tissue and are used in CT scans and radiation therapy. Too much is a bad thing, since is the same type of radiation

that can cause radiation sickness and burns. 1) Visible light spectrum 2) Ultraviolet light 3) X-rays 4) Gamma Rays 1) These waves can penetrate solid objects and are used to diagnosis internal injuries. 2) These are the fastest waves but have the shortest

wavelengths. 3) These wavelengths are those we can see 4) These waves are the ones that give us sunburn. 5) These wavelengths are the colors of the spectrum. Light Interactions Reflection

Diffraction Absorption Scattering Refraction Reflection

Reflection occurs when light bounces off an object. The law of reflection states that the angle between a perpendicular line to a mirror and the beam of light is equal to the perpendicular line and the reflected light Types of reflection

Light reflects best on smooth surface such as a mirror so that all the beams bounce at the same angle. Light reflects worse on rough surfaces because the beams reflect in many angles. Absorption and Scattering Absorption is the transfer of energy carried by light

waves to particles of matter, as a result the light dims. Scattering is the release of light energy by particles of matter that has absorbed the energy. In the picture shown, air particles have absorbed the light and then scatters it making it look fuzzy. The edges of shadows are

fuzzy due to scattering. 1) Reflection 2) Absorption 3) Scattering 1. When light waves slowly fade away because the energy is transferred to matter (usually a gas)

2. Fuzzy shadows. 3. When a wave bounces off a shiny surface. 4. The release of light energy by particles of matter that has absorbed the energy. 5. Angle of incidence = angle of reflection Color The color of an object is the result of the reflection

of light that reaches your eyes. Part of the light is absorbed by the object, the reflection of a particular wavelength is the color you see. 1) Reflection 2) Absorption 3) Scattering C.

D Refraction Refraction is the bending of a wave as it passes at an angle from one medium to another. When light bends it produces a spectrum of color. Different types of light produce different spectrums.

The frequency of the wave, results in the color. Diffraction Waves can also bend by diffraction. The amount of diffraction depends on the size of the barrier or opening and the wavelength

1) Refraction 2) Diffraction Using refraction in reading glasses -Looking through a concave lens so you can see near. Shaped like a cave Using refraction in reading glasses Looking through a convex lens so you can see far. Curved outward

1) Concave or 2) Convex 1) Telescope - 2 2) Microscope - 1 3) A peephole in your front door - 2 1) Concave or 2) Convex

Concave Mirrors allow you to see things larger Convex mirrors allow you to see large areas 1) Concave 2) Convex

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