Properties and characteristics of light 4

Properties and characteristics of light 4

• 2.
  Characteristic of Light •Lightis an electromagnetic wave. •Light travels in a straight line. •Light is a transverse wave, and does not need any medium to travel.
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  • electromagnetic waves (ofwhich visible light is oneexample) are transmitted as a signal that our radios pick up so we can listen to music. Pulses of infrared light are transmitted as signals so we can communicate with our TVs. This backgrounder is all about visible lightand how we interact with it.
• 4.
  Properties of Light •when light passes from one material into a second material like mirror or water, the light path is reflected back. •Reflection- light bounces back into the direction of the source. •objects that reflect light- Water, windows, shiny metal, and mirrors are some example. • Light bounce= ball bounces back on hard smooth surface
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  •When you throwa ball at an angle, it will bounce off at the same angle away from you. •Light reflects the same way off a mirror. Light bounces off at the same angle that it struck the mirror.
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  Application •Reflections in rear-view mirrors ofcars help to keep us safe.
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  Properties of Light •when light passes from one material into a second material like mirror or water, the light path is bent . • Refraction- bending of light as it travels from one type of material to another like from air to water.
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  Application •Refraction through lenses of eyeglassesor contact lens’ helps some people see better.
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  Primary Colors ofLight art class primary colors are red, yellow and blue. secondary colors orange, green and purple. Light primary colors: red, green, and blue secondary colors: cyan (made by combining blue and green), magenta (made by combining blue and red) yellow (made by combining green and red). *When the primary colors of light are combined, they make white light.
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  Colors of Light •Whitelight- has different colors which is the color of the rainbow. - all colors that we see around us are colors that come from the light of the sun.
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  Colors of Light •Rainbow-formed when the light from the sun passes through raindrops. •A rainbow is the result of sunlight breaking into different colors. As the light from the sun bends, it separates into different colors or the colors of the rainbow, which is red, orange, yellow, green, blue, indigo and violet or the ROYGBIV.
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  Speed of Light •movement of light - travels at approximately 299 792 458 metres per second (m/s) in a vacuum (a container with no air). – 300,000,000 m/s - An important thing to know about light is that it travels in a straight line through a material. - Speed of sound- approximately 300 m/s.
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  Waves and theSpectrum of Light • Light has the properties of waves. Like ocean waves. •Parts of Light waves:
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  Parts of Lightwaves: •1. crests- upper fold of the wave •2. troughs- lower portion of the wave •3. wavelength - The distance between one crest and the next, which is the same as the distance between one trough and the next. •4. frequency of a wave- is the number of crests (or troughs) that pass a point in one second. The wavelength multiplied by the frequency equals the speed at which the wave travels. •
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  Electromagnetic waves (whichvisible light)
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  •Red light hasthe longest wavelength, and the lowest frequency of the visible spectrum. •Violet has the shortest wavelength, and the highest frequency of the visible spectrum.
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  Light not visibleto humans Ultraviolet light and x-rays are also light, but have too small wavelength and too high frequency to be visible to us. Infrared light which can be detected by night-vision goggles, and radio waves, which are picked up by your radio so you can hear music, have wavelengths which are too long and frequencies which are too low to be seen by the human eye.