1. Light is an Electromagnetic Wave
By Mackenzie Cottle, Hao Vuong, Gian Carlos, Zach Totah

2. The Speed of an EM Wave An Electromagnetic wave is energy in motion
Most EM waves are invisible to humans, but still some can affect your body
Sound waves and water waves travel by making matter movements
Electromagnetic radiation depends on electric fields and magnetic fields
An EM wave moves with a certain
speed and has a certain wave length
Gian

3. EM Waves in a Vacuum In a vacuum, EM waves all travel the same speed
300,000 kilometers per second, also known as the speed of light
In calculations, this number is often referred to as the letter c
It takes much less than a second for any EM wave to travel to any two points on earth
The vast distances of space are often measured in units of light-years
Gian

4. The Electromagnetic Spectrum
The speed of EM waves in air is almost the same as it is in a vacuum
Scientists use ideas of spectrum to describe the possible frequencies of EM waves, or the electromagnetic spectrum
Wave lengths can be tens of kilometers or trillionths of a centimeter
Different terms describe the
different parts of the
electromagnetic spectrum
Hao: I am doing the electromagnetic Spectrum. Electromagnetic spectrum is the range of all electromagnetic frequencies. The speed of Em waves in air is almost the same as it is in a vacuum. Scientist used many ideas to describe the possible frequencies of Em waves, and one idea is spectrum. There are at least tens of kilometers or more of a centimeter in the wave length

5. Light Waves, Rays, and Particles
A wave will spread out, or radiate, from a central source
Electromagnetic Radiation is the energy that moves in the form of an EM wave
EM radiation is produced as tiny bundles of energy called photons
Matter absorbs light when it takes up the photons energy
The higher frequency a photon has, the more energy it will have
Hao

6. Ultraviolet, Gamma, and X-Rays
Type of Radiation
Positive effects
Negative effects
Ultraviolet: light that is used in hospitals, ponds, etc.
Can be used to sterilized medical tools and food
Can kill living cells and causes a high percent chance of cancer
Gamma: radiation very harmful to skin
Can detect nuclear explosions in space
Has a large amount of radiation given off
X-Rays: used in hospitals, electronics, etc.
Searches for broken bones and tumors
Can kill living cells and damage body
Mackenzie Electronics in X-RAY: used to see if melted points are put together well

7. Radio waves and Microwaves
Radio waves are produced easily by varying an electric current in a wire
EM waves can travel long distances without losing energy
Radio waves carry information in long distances, also used in radio broadcasts
Radio waves of higher frequencies are also called microwaves, cell phones and other technology use this
Microwaves bounce off of many
surfaces
Molecules tend to absorb waves
(microwave sends energy to food)
Zach

8. Infrared Radiation IR (Infrared Radiation) waves are easily
given off and absorbed by solids, liquids,
and some gases
Cannot be seen, but can be felt as heat
Most objects on earth are giving off radiation in low frequencies
The high frequencies near visible light range are called near-IR
EM spectrums that humans can pick up are called visible light
The range is small, so small that only half of the radiation from the sun that reached the ground is visible light
Zach