The Electro-Magnetic Spectrum

    • The Electro-Magnetic Spectrum is the list of all the possible electromagnetic frequencies


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external image electromagnetic-spectrum.jpg

If you didn't notice...as the frequency gets higher, the wavelength gets shorter or closer together. Also, the most energy is needed when the frequency gets bigger. So gamma rays produce the most energy...Radio Waves produced the least energy.


Radio Waves

Longest wavelengths λ
Radio Waves are produced when charged particles move back and forth in instruments such as antennas
They can be disturbed by obstacles and weather



Microwaves


Highest frequency of RADIO WAVES

Wavelengths λ are only a few centimeters long
The water from the food absorbs energy, which produces heat. This is how a microwave works.


Infrared Rays


These frequencies are slightly lower than Visible Light Rays

Cannot be seen, but can be felt as heat (light bulbs, stoves, sun)
All objects give off some quantity of infrared; the quantity just depends on the temperature of the object.
Hotter objects give off more infrared rays



Visible Light


Red
, orange, yellow, green, blue, indigo, and violet are the possible visible colors
Visible Light is the smallest portion of the spectrum
Visible Light is very important!! We couldn’t survive without it.
Visible Light is needed for Photosynthesis which produces oxygen which keeps us alive!
The speed of light is 299,792,458 meters per second...REALLY FAST!




Ultra-Violet Rays (UV Rays)


Frequencies are just higher than Visible Light

UV Energy is great enough to kill living cells
UV lamps are used in hospitals and green houses to kill bacteria and to preserve foods and nutrients in plants.



X-Rays


Frequencies are just higher than UV Rays

It is strong enough to pass through many materials, including skin
It also goes through clothes, shoes, and hair
However, the bones absorb X-Rays; this is how X-Rays work



Gamma Rays


Highest frequencies

Shortest wavelengths λ
Highest energy on the Electro-Magnetic Spectrum
Radioactive materials and nuclear materials emit Gamma Rays



RADIO WAVES
old_radio.jpg

MICROWAVES
Commercial_Microwave_Oven.jpg


INFRARED
GP4294.jpg


VISIBLE LIGHT
rainbow-swirl-wallpaper.jpg


ULTRA-VIOLET (UV) RAYS
Sun_021203.jpg


X-RAYS
asha-2.jpg


GAMMA RAYS

egret_gro.gif