Electro Magnetic Spectrum Flashcards
What is reflection?
Reflection occurs when a wave strikes an object or surface and bounces off
What is refraction?
The bending of a light wave as it moves from one medium into another
The changing of speed when it moves through one substance to another
What is diffraction
The bending and spreading of waves
What is are waves?
Waves are regular disturbances that carry energy through matter and space without carrying matter
What are mechanical waves?
Waves that require matter ( medium ) to carry energy
Transmit energy by displacing the molecules in the medium which they travel.
Water waves
Sound waves
Seismic waves
What are electro magnetic waves?
Waves that do not require matter ( medium ) to carry energy
They are also radiation waves. The higher the frequency the more energy in the waves
Lowest= radio waves Highest = gamma rays
What are Transverse waves?
It is a wave that has a crest and trough
Looks like water waves
What are compression waves?
Matter in the medium moves forward and backward in the same direction the wave travels
Like a slinky
Sound waves
What is frequency?
Is the number of waves that pass a given point in 1 second
What is light?
Light carries energy. Ex sun gives off light waves
Light is a special type of wave called a electromagnetic wave
What is opaque?
Materials that let no light pass through them are opaque
They absorb the light
What is transparent?
Materials that allow all light to pass through is transparent
They let light pass through the object
What is translucent?
Allow some light to pass through two other objects behind them can not be seen clearly
Wax paper
Frosted glass
What is matter made of?
Matter is made of different types of bonds and atoms
Radio waves
Have the longest wavelength and the lowest frequency
Used in Radar, cooking food, satellite, transmission
1000 of meter to .001 meters
What is mirage
When heat reflects off a hot surface and hits the cold air from the atmosphere. The waves refracts and creating a mirage
Index of refraction
The angle of which light reflects off a object.
Infrared waves
Have a have shorter wave length and a high frequency. One wave that you can feel.
Used in finding people in the dark and in the tv remote
.001 to 700 nm
Visible light
Waves are the only EM waves that we can actually see.
700 nm to 400 nm
RoyGBiv
Ultra violet waves
400nm to 10 nm
Energy is enough to penetrate through living cells and cause damage.
Too much can lead to skin cancer or sunburn.
We need UV to produce vitamin d
Used in sterilize objects like equipment in hospitals
X-rays
10nm to .001 nm have enough penetrate deep into the cell tissue,but are stopped by dense materials
Used to look at solid structures or cracks or bones or buildings or air plane bodies.
Gamma rays
Have the shortest wavelength and highest frequency
Lest than 1 trillionth of a meter.
Most damaging to cell tissue
Hard to stop.
They are released by atomic reactions, nuclear power plants, and nuclear bombs.
What happens when the electric field ocsillates
Hit creates a magnetic fiel
