What can Electromagnetic waves travel through?
Empty Space and through matter
How do they travel
Vibrations in electrical/magnetic fields and in their properties
How fast do they travel?
300 Billion meters per second
- Number of waves to cross a point in 1 second
Frequency
What is a frequency?
Number of waves to cross a point in 1 sec.
What does a spectrum show?
Range of energy from low to high energy
High frequency waves have ____ wavelengths
Short
Low frequency waves have ____ wavelengths
Long
What is electromagnetic spectrum order? (Longest ->Shortest)
Radio, Microwave, Infrared, Visible, Ultraviolet, X-rays, Gamma Rays
Wavelengths of a Radio Wave
Long wavelengths, low energy/ frequency
Wavelengths of a Gamma Wave
Short wavelengths, high energy/ frequency
What are Radio Waves used for?
FM/AM Radios, Medical Machines (MRI)
What are Microwaves used for?
Microwave Ovens, Cellphones, pagers, and RADAR
What are infrared waves used for?
Heat lamps, thermograms
What is visible light?
Light we can see as different colors.
Highest wavelengths in visible light spectrum?
Red
Shortest wavelength in visible light spectrum?
Violet
How does the human eye see colors?
When they are bent
When do we see white light?
When all the colors are being reflected
When do we see black light?
When all the colors are being absorbed
What are UV Rays used for?
To kill bacteria, Helps skin produce Vitamin D
What can happen if you are exposed to UV Rays too much?
Can cause skin cancer
What are X-Rays used for?
Bones and teeth can absorb it, can penetrate matter
Exposure to too much X-Rays can cause____
Cancer
What are Gamma Rays used for?
Radiation treatment to kill cancer cells.
- Form of energy that travels as a wave
Light
What type of animals can see uv light?
Bees
- Wave made of changing electric and magnetic field strengths
Electromagnetic wave
What do some infrared waves from the sun do?
Give off warmth and keeps living things on Earth warm.
What gives off infrared waves?
All objects including humans.We give it off when we don't absorb a color or light and reflect it.
What does visible light do?
Changed into chemical energy by green plants during photosynthesis