Electromagnetic Spectrum The Electromagnetic Spectrum

Electromagnetic Spectrum Name for the range of light waves when placed in order of increasing frequency All electromagnetic waves travel at the same speed, but have different wavelengths and frequencies

Calculations Red Monkeys In Virginia Use X-ray Guns **Speed = wavelength x frequency** Increase frequency = decrease wavelength Decrease frequency = increase wavelength **Increase frequency = increase energy** Red Monkeys In Virginia Use X-ray Guns

Radio Waves Longest wavelength, lowest frequency Lowest energy of the light waves! Uses: AM and FM Radio: the number on your dial is the frequency

Microwaves Shorter wavelength, greater frequency than radio waves Can pass through glass and plastic Reflects off metal Uses: cell phones, RADAR, MRI

Infrared Waves Shorter wavelength, greater frequency than microwaves Means below red Snakes can see infrared Uses: Heat rays Heat bulbs Thermogram Camera with night detection

Visible Light Shorter wavelength, higher frequency than infrared You can see these Longest wavelength is red Shortest wavelength is purple Order is: ROY G BIV

Visible Light Primary Colors: three colors used to make any other colors (red, blue, and green) When combined in equal amounts they will produce white light

Visible Light and Color The color of an object is the light that is reflected, the other colors are absorbed by the object Pigments: used to color materials; as they are added fewer colors of light are reflected and more are absorbed When all colors are reflected we see white When all colors are absorbed we see black When red, yellow, and blue combine they create black colors

Ultraviolet Rays Shorter wavelength, greater frequency than visible light Can damage or kill living cells, causing skin cancer or damage to eyes Bees can see UV The sun’s emission of ultraviolet rays

Ultraviolet Rays Uses: To kill bacteria in hospitals Small doses are good to acquire vitamin D which is good for teeth and bones Treats jaundice in newborns Tanning beds

X - Rays Shorter wavelength, greater frequency than ultraviolet rays Can penetrate most objects, but dense bone and lead Overexposure can lead to cancer Uses in buildings to find cracks, make pictures of bones

Gamma Rays Shortest wavelength, with greatest frequency Has the most energy of all light!! Most penetrating Objects in space give off gamma rays, but our atmosphere protects us against them Uses: Kills cancer cells and can be used to examine the body’s internal structure Moon in the night sky if you could see gamma rays