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Radiation A form of energy (radiant) Travels through space without needing a medium http://antwrp.gsfc.nasa.gov/apod/ap030719.html

Radiation Travels outward from the source in all directions Can be thought of as a wave http://www.lclark.edu/~krauss/hatchetweb/chapter11lorena/images/ripple.jpg

### Wave in motion :

Wave in motion http://www.silcom.com/~aludwig/images/snake.gif

### Parts of a Wave :

Parts of a Wave Nodes CREST TROUGH http://www.nr.usu.edu/Geography-Department/rsgis/Remsen1/emspec/images/wave.gif

### Definitions :

Definitions Crest The top of a wave, encompassing the area above the zero baseline http://www.cen.bris.ac.uk/civil/students/eqteach97/images/crest.gif

### Definitions :

Definitions Trough The bottom portion of a wave, including the entire area below the zero baseline http://www.cen.bris.ac.uk/civil/students/eqteach97/images/crest.gif

### Definitions :

Definitions Wavelength  “lambda” The distance from one crest to the next Measured in units of length, such as m, km, mm, nm http://media.nasaexplores.com/lessons/03-033/images/wavelength.jpg

### Definitions :

Definitions Amplitude A The distance from the zero baseline to the top of the crest, or to the bottom of the trough http://www.cen.bris.ac.uk/civil/students/eqteach97/images/crest.gif

### Definitions :

Definitions Frequency  “nu” The number of waves that pass a point in one second Measured in units of Hertz (Hz) or “per second” (s-1)

### Mathematics :

Mathematics As waves travel through space from their point of origin, they spread out. Inverse Square Law http://www.squ1.com/light/images/size.jpg

### Mathematics :

Mathematics c =  Speed of light = wavelength x frequency c = 3.00 x 108 m/sec (speed in a vaccuum) Light speed is very slightly different in different medium (air, water)

### Speed of Light :

Speed of Light It takes about 1.3 seconds for light to travel from the moon to the earth. antwrp.gsfc.nasa.gov/ apod/image/earthmoon.gif

### Speed of Light :

Speed of Light It takes about 8 minutes for light to travel from the sun to the earth. http://www.people.fas.harvard.edu/~junliu/Photos/sun.JPG

### Mathematics :

Mathematics http://geography.uoregon.edu/shinker/geog101/lectures/lec01/lec01_figs/wavelength-and-frequency-fig2-5.gif

### Mathematics :

Mathematics   1/ Shorter wavelength = higher frequency Longer wavelength = lower frequency www.cartage.org.lb/.../ Wavelength2.htm

### Mathematics :

Mathematics Frequency and the Energy of light have a direct relationship. High frequency light has high energy. Low frequency light has low energy.

### Ionizing and Non-ionizing Radiation :

Ionizing and Non-ionizing Radiation Ionizing Radiation – High energy radiation with enough energy to remove electrons from substances. Harmful! Non-ionization energy – Low energy light that is unable to remove electrons from substances.

### Types of Non- Ionizing EM Radiation :

Types of Non- Ionizing EM Radiation Radio More than .1 meter wavelength Less than 3 GHz frequency

### Types of Non- Ionizing EM Radiation :

Types of Non- Ionizing EM Radiation Microwaves .001 to .1 meters (1-100 millimeters) wavelength 3-300 GHz frequency

### Types of EM radiation :

Types of EM radiation Infrared (heat) 0.7-1000 m (micrometers) wavelength 300-40000 GHz (3 x 1011 - 4 x 1014 Hz) frequency

### Types of Non- Ionizing EM Radiation :

Types of Non- Ionizing EM Radiation Visible (light) 400-700 nm (nanometers) wavelength 4 x 1014 - 7.5 x 1014 Hz frequency Red, Orange, Yellow, Green, Blue, Indigo, Violet (arranged long wavelength to short, low frequency to high)

### Types of Ionizing EM Radiation :

Types of Ionizing EM Radiation Ultraviolet (blacklight) 10-400 nm wavelength 7.5 x 1014 - 3 x 1016 Hz frequency

### Types of Ionizing EM Radiation :

Types of Ionizing EM Radiation X-ray 10-10000 pm (picometers) wavelength 3 x 1016 - 3 x 1019 Hz frequency

### Types of Ionizing EM Radiation :

Types of Ionizing EM Radiation Gamma ray (nuclear radiation) Less than 10 pm wavelength More than 3 x 1019 Hz frequency

### Types of EM radiation :

Types of EM radiation All types of electromagnetic radiation are essentially the same. The differences are arbitrary definitions we have made based on how we use the various waves.

### Rem :

Rem Rem – is a unit used to measure the amount of radiation that affects organisms. A single dose of 100 rem can cause sickness!! www.klimonitors.com