Unit 9: Electromagnetic waves

We learned that light moves in a straight line and at the velocity of 3 x 10^8 m/s. That means in one second, light can go to the moon and back. It also means that, in the same amount of time, light can go around the world 7 1/2 times. We learned about the concept of transparent and opaque. Transparent material lets certain waves through while opaque blocks majority (all visible light) all together. Like how an x-ray can see through your skin and muscle but your bones show up; your skin and muscle is transparent to the x-rays even though your bones are not.