1. *Electromagnetic waves are produced by changing the motion of charges or by changing magnetic fields. *Electromagnetic waves can travel through matter, but they do not require a medium. *All electromagnetic waves move in a vacuum at the speed of light. *Types of electromagnetic radiation are distinguished from each other by their wavelength and energy. EXPECTATIONS

2. 1.ELECTROMAGNETIC RADIATION (WAVES) IS ENERGY EMITTED FROM VIBRATING ELECTRIC CHARGES. ANIMATION – E-WAVES http://www.phy.ntnu.edu.tw/java/emWave/emWave.htmlhttp://www.phy.ntnu.edu.tw/java/emWave/emWave.html 2. THE WAVES ARE COMPOSED OF AN ELECTRIC FIELD AND A MAGNETIC FIELD OSCILLATING AT RIGHT ANGLES TO ONE ANOTHER.

3. Interacting electric and magnetic fields creating electromagnetic waves.

4. 3. ELECTROMAGNETIC WAVES DO NOT REQUIRE A MEDIUM AND TRAVEL AS TRANSVERSE WAVES. 4. EM WAVES ALL TRAVEL AT THE SPEED OF LIGHT (300,000,000 M/S!!!!)

5. 5. THE ELECTROMAGNETIC SPECTRUM RANGES FROM THE LOWEST FREQUENCY TO HIGH FREQUENCY WAVES. *LOWER FREQUENCY WAVES HAVE LESS ENERGY THAN HIGH FREQUENCY WAVES.

6. A.RADIO WAVES- LOWEST FREQUENCY WAVES. -RADIO WAVES ARE USED FOR RADIOS, T.V.S, M.R.I.S AND IN RADIO TELE- SCOPES USED BY ASTRONOMERS TO COLLECT RADIO WAVES FROM SPACE. RADIO WAVES ON THE EM SPECTRUM

7. A SET OF RADIOTELESCOPES

8. -MICROWAVES- HIGH FREQUENCY RADIOWAVES. -MICROWAVES ARE USED IN OVENS, TRANSMITTING CELL PHONE SIGNALS AND IN WEATHERCASTING BECAUSE THEY GET SPREAD OUT BY WATER DROPLETS.

9. B. INFRARED RAYS- THESE RAYS ARE INVISIBLE TO US BUT CAN BE FELT AS HEAT. ALL OBJECTS GIVE OFF INFRARED RAYS- WARMER OBJECTS GIVING OFF THE MOST. -INFRARED RAYS ARE USED IN REMOTE CONTROLS.

10. -INFRARED RAYS ARE USED TO TAKE THERMAL PICTURES. -INFRARED RAYS ARE ALSO USED IN HEAT LAMPS TO KEEP FOOD WARM. THERMOGRAM

11. C. VISIBLE LIGHT – THESE ARE THE ONLY ELECTROMAGNETIC WAVES THAT WE CAN SEE. -VISIBLE LIGHT IS FOUND TOWARDS THE MIDDLE OF THE SPECTRUM. -VISIBLE LIGHT IS USED BY PLANTS TO PHOTOSYNTHESIZE –MAKE THEIR OWN FOOD.

12. -VISIBLE LIGHT APPEARS WHITE (CLEAR) BUT WHEN REFRACTED WE CAN SEE ALL OF THE COLORS OF THE SPECTRUM

13. D. ULTRAVIOLET(U.V.) RAYS – U.V. RAYS ARE USED TO KILL GERMS BECAUSE THEY ARE STRONG ENOUGH TO KILL CELLS. PEOPLE MUST PROTECT THEM- SELVES FROM U.V. RAYS FROM THE SUN OR THEY CAN CAUSE SKIN CANCER. -U.V. RAYS ARE INVISIBLE TO HUMANS, BUT SOME INSECTS CAN SEE THEM UV RAYS.

14. E. X-RAYS- HIGH ENERGY RAYS THAT CAN PASS THROUGH MANY MATERIALS INCLUDING HUMAN SKIN AND MUSCLES. -X-RAYS CAN BE USED TO SCAN DENSE PARTS INSIDE THE HUMAN BODY. BONES AND TEETH ABSORB X-RAYS. -X-RAYS ARE GIVEN OFF BY SOME STARS IN SPACE.

15. F. GAMMA RAYS- THE HIGHEST FREQUENCY AND THE MOST DANGEROUS. -GAMMA RAYS ARE EMITTED DURING SOME NUCLEAR REACTIONS AND BY SUPERNOVA EXPLOSIONS IN SPACE. -GAMMA RAYS ARE IN SOME RADIOACTIVE MATERIALS THAT CAN BE INJECTED IN HUMANS AND TRACED THROUGH THE BODY TO LOOK FOR PROBLEMS.

16. GAMMA RAYS ARE ALSO USED IN RADIATION TREATMENT FOR PEOPLE WITH CANCER.

17. BRAINPOP - ANIMATION VIDEO http://www.brainpop.com/science/energy/emspectrum/index.weml

18. Radio waves Microwaves Infrared waves Visible waves (red) (orange) (yellow) (green) (blue) (indigo) (violet) Ultraviolet waves X-Rays Gamma Rays Lowest Frequency, longest Waves, lowest energy Highest frequency, Shortest waves, highest energy