1. AM – amplitude modulation FM- Frequency modulation Warms you from the sun – skin absorbs wave White Light – entire range of colors on visible spectrum - ROYGBIV Bad: Causes skin cancer Good: produces vitamin D, kills bacteria on surgical tool Used to treat cancer

2. What is Light? Light is an electromagnetic wave Vibration of an electric field and magnetic field together Electromagnetic waves can travel through space or matter

3. What is Visible Light? Light travels at 300,000,000 m/s! It takes 8.3 minutes to travel from the sun to the earth It can travel around the earth 7 times in 1 sec

4. Interactions of Light Waves Reflection The bouncing back of a wave when that ray hits a surface that it does not go through

5. Reflection or Light Source The moon Does not produce its own light Illuminated by the reflection of the sun Visible object w/o its own light source Firefly Luminous Produces its’ own light

6. Absorption and Scattering Light Absorption- when a light beam shines through the air, particles absorb some of the energy – causing the light to be dimmer Scattering- interaction of light with matter that causes the light to change its energy, direction, or motion

7. Refraction Refraction – the bending of a wave as it passes through a material A prism causes white light to refract and separate into the colors of visible light (ROYGBIV) Red, Orange, Yellow, Green, Blue, Indigo, Violet

8. Diffraction and Interference Diffraction – a change in the direction of a wave when it finds an obstacle Interference – combination of 2 or more waves that result in a single wave Constructive – greater amplitude Destructive- smaller amplitude

9. Light and Color Transmission – the passing of light through matter Transparent – allows light to pass Translucent – transmits but also scatters light Opaque – does not transmit light

10. Opaque Objects Color Objects absorb some light and reflect other The colors that are reflected determine the color you see

11. Transparent & Translucent When the object is colored, you see the color of light that was transmitted through the material

12. Extra Credit Opportunity Write 2 GOOD well developed paragraphs about how rainbows are formed and why we see them as we do Double spaced NOT PLAGARIZED!!! Due Monday 10 possible points