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TRANSCRIPT
Grade 8 Science
Electromagnetic Spectrum
What is the Electromagnetic Spectrum
The Electromagnetic Spectrum is the spectrum where visible light energy
and all the invisible forms of radiant energy exist on the electromagnetic
spectrum.
Gamma Rays
- Gamma Rays have the shortest wavelength- While they have the shortest wavelength, they have the
highest energy- They result from nuclear reactions
X Rays
- The second shortest wavelengths- X Rays are good at penetrating tissue such as skin and
muscle- However, X Rays are absorbed by bones
Ultraviolet Radiation
- Ultraviolet Radiation is very energetic
- UV radiation comes from the sun
- It causes tanning, which is the skin’s
way of protecting itself
- It can damage the cornea, leading to
fogging in the cornea and causing a
slow loss of vision
Infrared Radiation
- A.K.A. heat radiation- Your eyes cannot see it, but your skin
can sense it- The hotter something is, the more
infrared rays it emits- Uses include motion sensors, burglar
alarms
Microwaves
- Microwaves have the second longest wavelengths
- This results in their lower energy- Microwaves use microwaves to heat
up objects- Microwaves use a specific
wavelength of microwaves that are absorbed by water particles. The waves cause the water particles to vibrate quickly and become hot
Radio Waves
- Radio waves have the longest
wavelengths and the lowest energy
of all the waves on the
electromagnetic spectrum
- Microwaves are a type of radio
waves
- Radio waves are used to broadcast
radio and television broadcasts
Visible Light
- Located to the right of the infrared waves and to the left of the ultraviolet waves
- The visible light spectrum consists of red (longest wavelength), orange, yellow, green, blue, indigo, and violet (shortest wavelength)
- The spectrum of visible light consists of a spectrum of wavelengths that range from approximately 700 nanometers (nm) to 400 nm
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