1. Electromagnetic Spectrum
The
Electromagnetic Spectrum

2. 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

3. 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

5. 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

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

7. 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

8. 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

9. 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

10. 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

11. 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

12. 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

13. 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

14. 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