Successfully reported this slideshow.
We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. You can change your ad preferences anytime.

Electromagnetic waves


Published on

Slides on the components of the EM spectrum

Published in: Technology, Education
  • Do This Simple 2-Minute Ritual To Loss 1 Pound Of Belly Fat Every 72 Hours ■■■
    Are you sure you want to  Yes  No
    Your message goes here

Electromagnetic waves

  2. 2. WHAT ARE EM WAVES? <ul><li>Electromagnetic waves (EM waves for short) are waves that can travel in a vacuum. </li></ul><ul><li>These waves are created by the vibration of an electric charge. </li></ul>
  3. 3. Electromagnetic Spectrum <ul><li>It is a group of different electromagnetic waves. </li></ul><ul><li>There are 7 components in the spectrum. </li></ul>
  4. 4. Electromagnetic Spectrum <ul><li>Gamma rays </li></ul><ul><li>X – rays </li></ul><ul><li>Ultraviolet </li></ul><ul><li>Visible light </li></ul><ul><li>Infra-red </li></ul><ul><li>Microwaves </li></ul><ul><li>Radio waves </li></ul>Highest frequency Shortest wavelength Lowest frequency Longest wavelength
  5. 5. Uses of Gamma Rays <ul><li>Kill cancer cells </li></ul><ul><li>Study the nucleus in atoms </li></ul>
  6. 6. Uses of X-rays <ul><li>Take ‘pictures’ of bones in the body </li></ul><ul><li>Study the crystal structure of crystalline substances </li></ul><ul><li>Check for cracks in metal plates </li></ul>
  7. 7. Uses of Ultraviolet <ul><li>Detect counterfeit notes </li></ul><ul><li>Gives the clothes a ‘glow’ effect in discotheques </li></ul><ul><li>Sun-tanning </li></ul><ul><li>Sterilise medical equipment </li></ul>
  8. 8. Uses of Visible Light <ul><li>Enable us to see things </li></ul><ul><li>Photosynthesis in plants </li></ul>
  9. 9. Uses of Infra-red <ul><li>Heating </li></ul><ul><li>Haze photography </li></ul>
  10. 10. Uses of Microwaves <ul><li>Radar communication </li></ul><ul><li>Analysis of the molecular and atomic structure </li></ul><ul><li>Telephone communications </li></ul>
  11. 11. Uses of Radio Waves <ul><li>Radar communications </li></ul><ul><li>TV and radio broadcasting </li></ul>
  12. 12. Common Properties of EM Waves <ul><li>All transverse waves </li></ul><ul><li>All travel at the speed of light. (3 x 10 8 m/s) </li></ul><ul><li>Can travel through solid, liquid, gas and vacuum </li></ul><ul><li>Obey the laws of reflection and refraction </li></ul><ul><li>All can be absorbed and emitted by matter </li></ul><ul><li>The wave equation is applicable to all </li></ul>