AST 101 Lecture Notes - Lecture 5: 30 Foot Fall, Electromagnetic Radiation, Atomic Number
21 Jul 2016
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Chapter 5 - light and matter: reading messages from the. The warmth of sunlight tells us that light is a form of energy. We can measure the flow of energy in light in units of watts: 1 watt = 1 joule/s. White light is made up of many different colors. Separating colors gives you important information on an object. Interactions of light with matter reflection and scattering. The surface of screen is not flat, so reflects light in all directions. Sunlight (white light) has colors and shines a rose with all the colors. That"s (cid:271)e(cid:272)ause the red rose reflects only red light. From the red color, we can learn that the rose is made of a material that reflects only red light. Astronomers use colors to learn about astronomical objects. Black cloths are warmer in sunlight because black absorbs more lights, and that"s why it looks black (no color).
