Kim Lachler Updated 2015 NCES :6.P.1.1 & 6.P.3.2

Absorption Absorption The transfer of light energy to particles of matter The transfer of light energy to particles of matter As a beam of light travels through the air, particles in the air absorb some of the energy. As a beam of light travels through the air, particles in the air absorb some of the energy. The further away it is from the source the dimmer it is. The further away it is from the source the dimmer it is.

Scattering An interaction of light with matter. This cause the light to change it’s energy, direction, or both An interaction of light with matter. This cause the light to change it’s energy, direction, or both The sky is blue because of scattering. The sky is blue because of scattering. Blue has a short wavelength making it scatters more, thus you see blue light Blue has a short wavelength making it scatters more, thus you see blue light

Interacting with Matter Transparent_and_Opaque_Materials.mov Transparent_and_Opaque_Materials.mov Transparent_and_Opaque_Materials.mov Transparent Transparent Matter that allows most of the light to pass through. Matter that allows most of the light to pass through. Window Window

Interacting with Matter Translucent Translucent Matter that allows some of the light to pass through. Matter that allows some of the light to pass through. Wax paper Wax paper

Interacting with Matter Opaque Opaque Allows no light to pass through Allows no light to pass through Wall Wall

Visible Light Waves Light_and_Color.mov Light_and_Color.mov Light_and_Color.mov White light is made up of all visible colors. White light is made up of all visible colors. Each color has its own wave length Each color has its own wave length

Visible Light Waves When white light passes through a different medium it is refracted and bends slightly. When white light passes through a different medium it is refracted and bends slightly. Each wave length refracts and bends slightly different. Each wave length refracts and bends slightly different. This results in white light being separated into colors This results in white light being separated into colors

Visible Light Waves Colors Colors Red Red orange orange yellow yellow green green blue blue indigo indigo Violet Violet rainbow – water droplets act as a prism R O Y G B I V

Color When light strikes an object it can pass through it, be absorbed, or reflected. When light strikes an object it can pass through it, be absorbed, or reflected. What wave lengths that are reflected determine what color you see. What wave lengths that are reflected determine what color you see.

Color White – all visible wave lengths are reflected White – all visible wave lengths are reflected Black – all visible wave lengths are absorbed - absence of color. Black – all visible wave lengths are absorbed - absence of color. Other colors – only some of the visible wave lengths are reflected. Other colors – only some of the visible wave lengths are reflected.

Color Primary light colors- three colors that can be mixed to produce light of any other color. Primary light colors- three colors that can be mixed to produce light of any other color. Red Red Green Green Blue Blue

Brightness Amplitude tells how much energy is in the light. Amplitude tells how much energy is in the light. The bigger the amplitude the brighter the light. The bigger the amplitude the brighter the light.

Bibliography Holt, Rinehart, Winston, North Carolina Holt Science & Technology, Holt, Rinehart, Winston, Orlando, 2005 Holt, Rinehart, Winston, North Carolina Holt Science & Technology, Holt, Rinehart, Winston, Orlando, 2005 NASA, The Electromagnetic Spectrum, accessed 1/26/11 NASA, The Electromagnetic Spectrum, accessed 1/26/11http://science.hq.nasa.gov/kids/imagers/ems/index.html Google images, googleimages.com, access 1/31/11 Google images, googleimages.com, access 1/31/11