POWEPOINT KO ABOUT_Forms_of_Electromagnetic_wave.pptx

COT PPT

1. ARRANGE ME!

2. C R I T E R I A

3. FORMS OF ELECTROMAGNETIC WAVE

4. enumerate the different forms of electromagnetic wave; LEARNING OUTCOMES 01 02 03 identify examples and application of each form of EM waves ; and appreciate the importance of EM waves in our daily lives.

5. THE ELECTROMAGNETIC SPECTRUM

6. USES AND APPLICATION OF THE DIFFERENT FORMS OF EM WAVES

7. Radio waves have the longest wavelength in the electromagnetic spectrum. They are produced by making electrons vibrate in an antenna. They are used to transmit sound and picture information over long distances. Radio waves have a very wide range of wavelengths. RADIO WAVES

8. Police radios Radio controlled toys Radio and Television Communiation RADIO WAVES USEFUL APPLICATION

9. Microwaves have smaller wavelengths than radio waves. They can penetrate the atmosphere of the earth. This is the reason why they are used in satellite communications. Communication satellites travel around the earth at an altitude of 35, 000 km above the equator. They move at a speed of 11300 km/h and revolve around the earth every 24 hours, the same rate as the rotation of the earth. Microwave signals are transmitted by an antenna to a satellite which amplifies and re- transmits the signal to an antenna in other parts of the world. MICROWAVES

10. Satellite communication Radars TV transmission Microwave oven APPLICATIONS OF MICROWAVES

11. Infrared radiation lies beyond the red end of the visible light. It is emitted by all objects. The amount and wavelength of radiation depend on temperature. Below 500° C, an object emits only infrared radiation. Above 500°C, an object glows and emits both infrared and some visible light. Our bodies radiate infrared and under infrared camera or a night vision goggle, our images appear in variety of colors. The differences in color determine the differences in temperature. INFRARED

12. Remote controls Infrared scanners Night-vision goggles Camera Autofocus Themograms INFRARED RADIATION USEFUL APPLICATIONS

13. VISIBLE LIGHT The visible light shares the thinnest slice in the electromagnetic spectrum. It lies in between the infrared and the ultraviolet rays. It is the only EM wave perceived by the human eyes. If not because of this visible light, we will not be able to see the beauty of our surrounding much less appreciate it. White light, like that of the sunlight is made up of a variety of colors arranged as follows: red, orange, yellow green, blue, indigo and violet. Though this color travels at same speed, they come in different wavelengths.

14. VISIBLE LIGHT USEFUL APPICATION Plant photosynthesis Artificial lighting Screens of electronic devices

15. ULTRAVIOLET RADIATION Ultraviolet radiation lies just beyond the violet end of the visible. spectrum. Ultraviolet waves have shorter wavelengths than the visible light and carry more energy. Ultraviolet radiation is the part of the electromagnetic spectrum that consists of frequencies higher than that of the visible light but lower than X-rays. Having higher frequency, UV rays carry higher amount of energy.

16. ULTRAVIOLET RADIATION BENEFITS AND USES Sterilization of water in drinking fountains Check signatures on a passbook Identifying original or fake banknotes

17. X-RAY X-rays come just after ultraviolet rays. They are of shorter wavelength but carries higher energy than the UV. X-rays are produced using an X-ray tube. They are emitted when fast moving electrons hit a metal target. X-rays were discovered by Wilhelm Conrad Roentgen in 1895.

18. X-RAY X-rays come just after ultraviolet rays. They are of shorter wavelength but carries higher energy than the UV. X-rays are produced using an X-ray tube. They are emitted when fast moving electrons hit a metal target. X-rays were discovered by Wilhelm Conrad Roentgen in 1895.

19. USEFUL APPLICATION OF X-RAY Medical Use Engineering Applications

20. GAMMA RAY Gamma rays lie at the other end of the electromagnetic spectrum. They are the shortest in wavelength and highest in frequency. They carry the highest amount of energy thus they are more dangerous. Gamma rays are emitted by stars and some radioactive substances. They can only be blocked with lead and thick concrete.

21. Medical Treatment Radiotheraphy Nuclear reactions USES OF GAMMA RAY

22. EM WAVES APPLICATIONS/USES Radio Waves Microwaves Infrared Radio and television communication Satellite communication, terrestrial communications, RADAR, microwave ovens Remote controls, infrared scanners, night- vision goggles, camera autofocus, thermograms

23. Ultraviolet Rays X-rays Gamma rays Sterilization of water from drinking fountains, check signatures on a passbook, used to identify fake banknotes Medical use, engineering applications Medical treatment, radiotherapy, nuclear reactions Visible Light Plant photosynthesis, artificial lighting, optical fibers in medical uses, screens of electronic devices

24. GROUP ACTIVITY Make a presentation on how these forms of electromagnetic waves affect your daily lives by doing?making the following according to your choices Act or play Poem Essay Drawing Song writing etc

25. YOU ONLY HAVE 5 MINUTES TO PREPARE

26. QUIZ !

27. EM Waves Applications/ Uses                           1-14. Fill in the table with the 7 forms of EM waves in proper order as indicated in the EM spectrum and write the uses/applications of each form of EM waves 15. If you are going to choose among these forms of EM waves which do you think is the most important or beneficial to you and why? Q U I Z !

28. ASSIGNMENT WHICH AMONG THE FORMS OF EM WAVES YOU ARE MORE EXPOSED TO? identify the negative effects of each form of EM waves

29. THANK YOU FOR LISTENING!