#2 APPLICATIONS & EFFECTS OF EM WAVES.pptx

science 10 quarter 2

1. ELECTROMAGNETIC RADIATION

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5. Electromagnetic radiation is a special kind of energy that travels in waves through space. It is like a wave of energy that can move without needing anything else to carry it, even in empty space. ELECTROMAGNETIC RADIATION

6. TYPES OF ELECTROMAGNETIC RADIATION Radio waves Microwaves Infrared Visible Light

7. TYPES OF ELECTROMAGNETIC RADIATION Visible Light Ultraviolet X-Radiation Gamma Ray

8. ACTIVITY 1 – JIGSAW ACTIVITY ON EM WAVE APPLICATIONS

9. INSTRUCTIONS 1 class will be divided into 7 groups. 2 each group will be assigned an EM Wave. 3 research about its uses and hazards. 4 prepare a poster 5 Group Presentation (3-5 minutes)

10. Broadcasting of radio and television signals. Wireless communication (cellphones, Wi-Fi, satellite). RADIO WAVES 01 Applications

11. Prolonged exposure to strong radiofrequency (RF) radiation may cause tissue heating. Possible interference with medical devices like pacemakers. RADIO WAVES 01 Hazards

12. Cooking food (microwave ovens). Radar and satellite communications. MICRO WAVES 02 Applications

13. Can cause burns or tissue damage if leaked from microwave ovens. Prolonged exposure may affect the eyes, leading to cataracts. MICRO WAVES 02 Hazards

14. Remote controls, thermal imaging, and night-vision cameras. Medical treatments such as heat therapy for muscle pain. INFRARED RADIATION 03 Applications

15. Excessive exposure can cause skin burns. High-intensity IR can damage the eyes. INFRARED RADIATION 03 Hazards

16. Essential for vision and illumination. Used in photography, optical instruments, and lasers. VISIBLE LIGHT 04 Applications

17. Very bright light or lasers can cause eye damage. Overexposure to artificial lighting can disturb sleep cycles. VISIBLE LIGHT 04 Hazards

18. Sterilization and disinfection (kills bacteria and viruses). Helps the body produce Vitamin D from sunlight. ULTRAVIOLET RADIATION 05 Applications

19. Overexposure causes sunburn, skin aging, and eye problems. Increases risk of skin cancer. ULTRAVIOLET RADIATION 05 Hazards

20. Medical imaging to view bones and internal organs. Security scanners at airports. X-RADIATION 06 Applications

21. Excessive exposure damages cells and tissues. Increases risk of cancer with repeated exposure. X-RADIATION 06 Hazards

22. Cancer treatment (radiotherapy). Sterilizing medical equipment and food preservation. GAMMA RADIATION 07 Applications

23. Extremely penetrating, can destroy living cells. High exposure leads to radiation sickness, genetic mutations, and cancer. GAMMA RADIATION 07 Hazards

24. ACTIVITY 2: EM WAVE APPLICATION HUNT

25. ACTIVITY 2: EM WAVE APPLICATION HUNT Work with your group to search the classroom for hidden cards showing different applications of electromagnetic (EM) waves. Each card contains an image, description, or real-life scenario (example: MRI machine, satellite TV, or infrared thermometer). Once you find a card, decide which EM wave region it belongs to:

26. ACTIVITY 2: EM WAVE APPLICATION HUNT After matching all your cards, prepare to present one application. In your presentation, explain: What the application is used for. Why that specific EM wave is suitable for the job. Be ready to share your group’s answers with the class.

27. ACTIVITY 2: EM WAVE APPLICATION HUNT Type of EM Radiation Cause (Exposure/Use) Effect on Living Things Effect on Environment Radio Waves Microwaves Infrared (IR) Visible Light Ultraviolet (UV) X-Rays Gamma Rays

28. ACTIVITY 2: EM WAVE APPLICATION HUNT Causes Remote controls, heaters, thermal imaging Medical imaging, security scanners Used in microwave ovens, satellites, radar Use in communication (radio, TV, cellphones) Sunlight, artificial lights Nuclear reactions, cosmic rays, medical cancer treatment Sunlight, tanning beds, sterilization lamps

29. ACTIVITY 2: EM WAVE APPLICATION HUNT Effects on Living Things Usually safe at low levels; prolonged exposure to strong signals may cause mild heating of tissues Overexposure causes cell damage, genetic mutations, cancer risk Highly penetrating; causes severe cell damage, radiation sickness, mutations Can cause skin burns or heat stress if intense Causes sunburn, premature aging, skin cancer; but also helps produce Vitamin D Prolonged exposure can cause tissue heating, possible cataracts Enables vision; too much exposure causes eye strain or damage (bright light, lasers)

30. ACTIVITY 2: EM WAVE APPLICATION HUNT Effects on Environment Minimal direct effect; excessive radio towers may affect bird navigation Overuse may disrupt natural habitats (e.g., satellite towers) Contamination from nuclear accidents (e.g., Chernobyl, Fukushima) harms ecosystems for decades Excessive IR from industrial use can raise local temperature Improper disposal of X-ray machines can release harmful radiation Light pollution disrupts nocturnal animals and plant cycles Damages crop, reduces plankton growth, harms ecosystems (ozone depletion makes this worse)

31. DEBATE: Do the benefits of EM radiation outweigh the harms?”

32. “EM radiation harms outweigh its benefits.” YES “EM radiation benefits outweigh its harms NO

33. ASSESSMENT: 10-ITEM MATCHING QUIZ

34. ASSESSMENT: MATCHING TYPE Effects on Living Things 1. Ultraviolet (UV) radiation can cause skin cancer, but it also helps the body produce Vitamin D. 2. Gamma rays are the least energetic form of electromagnetic radiation. 3. Prolonged exposure to X-rays can increase the risk of cell damage and cancer. 4. Light pollution caused by excessive artificial lighting can disrupt the behavior of nocturnal animals. 5. Radio waves are used for communication and are completely harmless at all exposure levels.

35. ASSESSMENT: MATCHING TYPE Effects on Living Things 6. Microwave radiation can cause tissue heating and is carefully regulated in microwave ovens. 7. Visible light is essential for photosynthesis in plants but can cause eye strain if too intense. 8. Infrared radiation provides warmth but excessive exposure can lead to burns or heat stress. 9. The destruction of the ozone layer increases the amount of UV radiation reaching the Earth’s surface. 10. Electromagnetic radiation is always harmful and has no beneficial uses in society.

36. Thanks for Listening!