Electromagnetic waves

Electromagnetic waves

1. They are

   • Waves that transmit energy
   • Produced by the movement of charged particles

2. They have

   • Crests
   • Throughs
     • The distance between them
       • Is called wavelength
         • Nanometers
       • And the times they are repeated
         • Defines its frequency
           • Per unit of time

3. Radiowaves

   • They have the largest wavelength
     • In fact
       • The distance between crests and throughs
         • Can be the size of a planet
   • Discovered by Heinrich Herz
   • They helped
     • To begin with radio astrology
     • To discover planets far away
     • To begin with the radio and television

4. Microwaves

   • They have a wavelength
     • Between 7cm and 1mm
   • In daily life
     • They are used for
       • Phones
       • Microwave ovens
   • They are divided in wavelengths
     • For example
       • C microwaves
         • Used in microwaves
       • L microwaves
         • Used for forest maping
   • Also used in
     • GPS
     • Give us information about the origin of the universe

5. Infrared waves

   • Discovered by Herschell
     • He measured the temperature of the wave under red spectrum
   • Wavelength
     • From 760nm to 1,000,000nm
   • Used in
     • Discovering other planets
       • They wouldn't have been visible to human eye
     • Measuring Earth's radiation budget
       • Also Earth's temperature
     • See vegetation from satelites

6. Visible light waves

   • Discovered by Isaac Newton
     • Throigh refraction of light on a prism
   • Used to
     • Determine the elements from which atmospheres are made
     • To determine the amount of energy on an object
       • Color of a flame
     • To see how Mars' landscape is
   • Here on Earth
     • To see how towns and cities are growing
     • Altitude of the clouds
     • Earth's surface
       • Topography

7. Ultraviolet waves

   • Discovered by Johann Ritter
     • Through an experiment of photographic paper
   • Wavelength
     • From 10nm to 400nm
   • Three types of UV
     • UV-A
     • UV-B
       • Dangerous to humans
     • UV-C
       • Dangerous to humans
   • Used to
     • Identify elements on other planets
     • See galaxies and stars

8. X-Rays

   • Wavelength
     • From 0.03nm to 3nm
   • Used to
     • Determine the atomic composition of objects
       • They discovered the one from DNA
     • See supernvas and their energy
     • Determine
       • Temperature
       • Density
       • Composition
       • Magnetic fields

9. Gamma Rays

   • The most dangerous waves of the spectrum
     • They have the energy to fry human cells
   • Shortest wavelength
     • The length of an atom
   • Used also to determine elements on other parts of the universe