Presentation on theme: "Energy Unit Week 34 Directions 1.Prepare your desk for science. Science notebook 2.Use voice level 0 (no voice) to review your light energy notes from."— Presentation transcript:
Energy Unit Week 34 Directions 1.Prepare your desk for science. Science notebook 2.Use voice level 0 (no voice) to review your light energy notes from notebook pg. 83.
Targets & Warm Up Targets: Students will understand how light can be reflected, absorbed, or refracted. Warm Up: How does light travel?
How does light travel? Light travels in straight lines called __________ that fan outward from the source of light. BUT Light can change when it strikes (hits) an object. Reflect Absorb Refract rays
Table of Contents DateTitlePage 5-19-15Behavior of Light84 Once you are finished with the Table of Contents, go to page 84 and add the title and date to the top of the page.
Reflection Occurs when light waves bounce, or reflect, from a surface back to our eyes Some objects reflect more light rays than others
Absorption Occurs when an object takes in the light wave After a light wave is absorbed, it becomes a form of heat energy
Color and Light We see colors because objects reflect and absorb light. An object is a certain color because it absorbs all colors except for the color that it reflects back to our eyes.
Color & Light What color is reflected? What color(s) are absorbed? Reflected: Red Absorbed: All other colors Reflected: None Absorbed: All colors Reflected: All colors Absorbed: None
Letting Light Through (Transmission) Transparent: Let most light rays pass Translucent: let some light rays pass Opaque: Do not let any light rays pass
How Light Changes Direction Light travels fastest through outer space where there is no matter Light slows as it travels through various mediums – Travels slowly in a gas – Travels more slowly in a liquid When light moves at an angle from one medium to another, some light… – Is reflected or absorbed – Passes through and changes directions (bends)
Refraction The bending of light caused by the change of speed that occurs when the wave passes from one medium into another Light travels from the pencil through water, though a glass, and through the air to your eye