waves of the electromagnetic spectrum eq: what is the electromagnetic spectrum?

Download Waves of the Electromagnetic Spectrum EQ: What is the electromagnetic spectrum?

Post on 21-Dec-2015

216 views

Category:

Documents

4 download

Embed Size (px)

TRANSCRIPT

  • Slide 1
  • Waves of the Electromagnetic Spectrum EQ: What is the electromagnetic spectrum?
  • Slide 2
  • Vocabulary Electromagnetic Spectrum Range of electromagnetic waves when they are ordered by increasing frequency Remember all EMW travel at the same speed, but they have different wavelengths and frequencies As the wavelength decreases, the frequency increases The amount of energy carried by EMW increases as its frequency increases. EQ: What is the electromagnetic spectrum?
  • Slide 3
  • Electromagnetic Spectrum Made up of 7 different types of waves EQ: What is the electromagnetic spectrum?
  • Slide 4
  • Radio Waves - EMW with longest wavelengths and lowest frequencies Can travel through a vacuum but most of our radio waves travel through air. 1. Antennas pick up radio waves from the air. 2. Then the radio waves go to the wires in your radio 3. The radio converts the EMW into sound that comes out your radio EQ: What is the electromagnetic spectrum?
  • Slide 5
  • Microwaves shorter wavelengths and higher frequency Microwave ovens and cell phones most common use EQ: What is the electromagnetic spectrum?
  • Slide 6
  • Cell Phones a transmitter and a receiver cell phones depend on an overlapping network of cells, or areas of land several kilometers in diameter cell tower in the center of cell receives and sends microwaves EQ: What is the electromagnetic spectrum?
  • Slide 7
  • Radar shortest wavelength microwaves Stands for radio detection and ranging Used to locate objects Use radio waves and the Doppler effect to calculate speed of vehicles EQ: What is the electromagnetic spectrum?
  • Slide 8
  • Infrared Waves Give off heat heat lamp, electric stove, toaster. Humans can sense it Have shorter wavelengths and higher frequencies than radio waves Infra means below below red on the color spectrum EQ: What is the electromagnetic spectrum?
  • Slide 9
  • Infrared Waves Thermogram pictures taken by infrared camera. Shows regions with different temperatures with different colors Used to detect motion of clouds, growth of plants EQ: What is the electromagnetic spectrum?
  • Slide 10
  • Visible Light The light we can see Longest wavelength of visible light are red, shortest is purple Rainbow or prism refracts, or bends the light waves to produce different colors EQ: What is the electromagnetic spectrum?
  • Slide 11
  • Visible Light Waves EQ: What is the electromagnetic spectrum?
  • Slide 12
  • Ultraviolet Rays UV rays Ultra is Latin for beyond, so these waves are just beyond the color violet Carry more energy than visible light because they travel at a higher frequency EQ: What is the electromagnetic spectrum?
  • Slide 13
  • Ultraviolet Waves UV lamps used to kill bacteria UV waves help produce vitamin D in the body, cause sunburn Help newborns who have jaundice EQ: What is the electromagnetic spectrum?
  • Slide 14
  • X - Rays Carry more energy than UV rays because of their higher frequency Can penetrate most matter with the exception of bone and lead. These are too dense EQ: What is the electromagnetic spectrum?
  • Slide 15
  • Gamma Rays Shortest wavelength and highest frequency Used in radiation therapy to kill cancer cells Examine bodys internal structure Supernova EQ: What is the electromagnetic spectrum?
  • Slide 16
  • Class Work and Homework Fill In What did I learn Confused Say Read pages 79 86 Electromagnetic spectrum jumble questions 1-6 and page 87 Are cell phones harmful? EQ: What is the electromagnetic spectrum?