LIGHT AND COLOR

LIGHT:PARTICLE  Light is made of tiny “packets” called photons.  The speed of light (in vacuum) is 300,000 km/s!  The circumference of the earth is about 40,075 km  In one second, a light beam can travel about 7.5 times around the earth

LIGHT:PARTICLE  The Michelson experiment  Calculating the speed of light using a rotating mirror

LIGHT:WAVE  Electromagnetic Spectrum  Radio Waves  Microwaves  Infrared  Visible (Light)  Ultraviolet  X-Rays  Gamma Rays Greater Frequency

LIGHT:WAVE

LIGHT:WAVE  Radio waves  Low frequency, hard to disrupt  Microwaves  Rotate water molecules  Infrared  Heat  Ultraviolet  Sunburn  X-Rays  Penetrate skin  Gamma Rays  Strongest energy in Universe

LIGHT  Light slows down when it passes through materials  Fiber Optics  Critical Angle

COLOR  White Light  Combination of all visible light  “Black Light”  The absence of light

COLOR  The color you see from an object is the color it reflects (doesn’t absorb)  What you see depends on what light reaches your eye