Electromagnetic Waves Spectrum Foldable Please get your notebook

Electromagnetic Waves Spectrum Foldable Please get your notebook and add this title to the next available page Click below for short NASA video

Gamma Rays X-rays Ultraviolet Rays Visible Light Infrared Rays Microwaves Radiowaves outside flaps

Sketch a model of the Electromagnetic This is also in the class reading

Electromagnetic Spectrum • The full range of frequencies, from radio waves to gamma rays, that characterizes light • The electromagnetic spectrum can be expressed in terms of energy, wavelength, or frequency. Each way of thinking about the EM spectrum is related to the others in a precise mathematical way.

Wavelength and Frequency important vocabulary • For any kind of wave there exists a simple relationship between wavelength and frequency. • The wavelength (a) is measured as the distance between two successive crests in a wave. • The frequency is the number of wave crests that pass a given point in space each second. • (b has a higher frequency that a)

Gamma Rays • Shortest wavelengths • Highest frequencies • Most penetrating of all waves

X-rays • Can penetrate most matter • Too much exposure can cause cancer • Useful in medicine

Ultraviolet Rays • Energy is great enough to damage or kill living cells • Insects can see this Images of a Mimulus flower in visible light (left) and ultraviolet light (right) showing a dark nectar guide that is visible to bees but not to humans

Visible Light • We can see it! • White light can be separated into red, orange, yellow, green, blue, and violet • Click on prism for short video

Infrared Rays • Wavelengths are shorter than radiowaves • We feel them as heat • Ex: heat lamps and infrared cameras

Microwaves • Radiowaves with the shortest wavelengths and highest frequencies • Ex: radar guns

Radiowaves • Longest wavelengths • Lowest frequencies • Used in broadcasting • Click on icon below for short video