The Electromagnetic Spectrum The electromagnetic spectrum includes a wide range of light waves, some that we can't see. Some of the non-visible types of waves are radio waves, microwaves, infrared rays, and X-rays. These types of waves have all sorts of uses in science and technology.

In the visible spectrum of light, the color of the light depends on the frequency. The visible spectrum is always the same for a rainbow or the separated light from a prism. The order of colors is red, orange, yellow, green, blue, indigo, and violet One of the characteristics of light is that it behaves like a wave. As a result, light can be defined by its wavelength and frequency. The frequency is how fast the wave vibrates or goes up and down. The wavelength is the distance between two peaks of the wave. Frequency and wavelength are inversely related, meaning that a low frequency wave has a long wavelength and vice versa. Frequency and Wavelength

Radio Carry information through radio and television Long wave Low frequency Microwaves Radio waves with shortest frequencies Used in microwaves and cell phone transmission

 Infrared  Often glows red as in a toaster. Not visible  UV or Ultraviolet  Can help your body make vitamin D  In large amounts can cause sun damage to skin

Visible Part of the spectrum that we can see Each wavelength has a different color X Ray Often used on humans Cannot penetrate bone. It is absorbed and shows as white color when developed

Gamma Rays Can be used in hospitals to treat cancer. Can be aimed at a tumor and kill the tumor in humans

How does an MRI work? ZvSG805Y What is the difference? MRI vs. CT Scan? D-B_hpbo

How do Stars make light?

When light strikes an object it can either be… Reflected Transmitted Absorbed See text pages ** Most objects reflect or absorb light

Types of Objects

Refraction

 Electromagnetic Spectrum   Light Energy 