Unit 10

LIGHT :D

Electromagnetic Waves are those that have transverse waves travelling perpendicular to the energy travelling longitudinally, (like what we did in class with out hands!) these are given off by light. We learned about light and waves today and how light has to strike an object and reflect it back into our eyes. Thats how we see colors and objects! There are two types of light, transparent and opaque (although it is relative). Transparent is when lights allows electromagnetic waves through, not visible to our sight. Opaque light is when electromagnetic waves aren't allowed to go through, thus making them visible to us. For example: Windows. A light year is the time it takes for light to travel for a year, but is measured as distance. The speed of light is about 3x10^8 m/s, faster than the speed of sound which is why there is a loud boom when you break the sound barrier!