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Electro magnetic wave(bpp)
This document discusses electromagnetic waves and their classification according to frequency. Electromagnetic waves include radio waves, microwaves, infrared radiation, visible light, ultraviolet radiation, X-rays, and gamma rays. All electromagnetic waves travel at the speed of light and differ in frequency and wavelength, with higher frequency waves having shorter wavelengths and higher energy. Examples are given of how each type of electromagnetic wave is used technologically and occurs naturally.
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Electro magnetic wave(bpp)
- 1. ELECTROMAGNETIC WAVES ByMr. Chaiporn Pattanajak
- 2. When an electricfield changes, so does the magnetic field. The changing magnetic field causes the electric field to change. When one field vibrates—so does the other. • The classification of electromagnetic waves according to frequency.
- 4. Nature of ElectromagneticWaves • They are Transverse waves without a medium. (They can travel through empty space) • Energy carrying waves emitted by vibrating charges often electrons that is composed of oscillating electric and magnetic fields that generate one another.
- 5. Electromagnetic Waves •Gammarays • X-ray •Ultraviolet • Visible light (ROYGBV)
- 6. Electromagnetic Waves •Infrared •Microwave •Radio wave
- 7. Electromagnetic Waves •All EM waves move at the same speed in a vacuum and differ from one another in frequency and wavelenght.
- 8. Electromagnetic Waves •longer wavelength=low frequency=low energy •Short wavelenght=high frequency=high energy
- 9. Electromagnetic Waves •Gamma rays • X-ray • Ultraviolet • Visible light (ROYGBV) • Infrared • Microwave • Radio wave
- 10. Electromagnetic Waves •The speed of all the waves in the EM spectrum is equivalent to the speed of light 299 792 453 m/s. (300,000,000m/s)
- 13. Electromagnetic Waves •You know more about the electromagnetic spectrum than you may think.
- 14. Waves ooff tthheeEElleeccttrroommaaggnneettiicc • Electromagnetic Spectrum—name for the range of electromagnetic waves when placed in order of increasing frequency • Click here (Animation—Size of EMwaves) RADIO WAVES MICROWAVES INFRARED RAYS ULTRAVIOLET RAYS VISIBLE LIGHT GAMMA RAYS X-RAYS
- 16. RRaaddiioo WWaavveess A.Havethe longestwavelengths and lowest frequencies of all the electromagnetic waves. B. A radio picks up radio waves through an antenna and converts it to sound waves.
- 17. Radio wave •Your radio captures radio waves emitted by radio stations, bringing your favorite tunes. Radio waves are also emitted by stars and gases in space.
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- 19. MMiiccrroowwaavveess • Microwaves—havethe shortest wavelengths and the highest frequency of the radio waves. – Used in microwave ovens. • Waves transfer energy to the water in the food causing them to vibrate which in turn transfers energy in the form of heat to the food. – Used by cell phones and pagers. – RADAR (Radio Detection and Ranging) • Used to find the speed of an object by sending out radio waves and measuring the time it takes them to return.
- 20. Microwave • Microwaveradiation will cook your popcorn in just a few minutes, but is also used by astronomers to learn about the structure of nearby galaxies.
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- 22. IInnffrraarreeddrraayyss • Infrared=below red • Shorter wavelength and higher frequency than microwaves. • You can feel the longest ones as warmth on your skin • Heat lamps give off infrared waves. • Warm objects give off more heat energy than cool objects. • Thermogram—a picture that shows regions of different temperatures in the body. Temperatures are calculated by the amount of infrared radiation given off. Therefore people give off infrared rays.
- 23. Infrared • Nightvision goggles pick up the infrared light emitted by our skin and objects with heat. In space, infrared light helps us map the dust between stars.
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- 25. VViissiibbllee lliigghhtt •Shorterwavelength and higher frequency than infrared rays. •Electromagnetic waves we can see. •Longest wavelength= red light •Shortest wavelength= violet (purple) light
- 26. Visible Light •Our eyes detect visible light. Fireflies, light bulbs, and stars all emit visible light.
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- 28. UUllttrraa--vviioolleett rraayyss •Shorter wavelength and higher frequency than visible light • Carry more energy than visible light • Used to kill bacteria. (Sterilization of equipment) • Causes your skin to produce vitamin D (good for teeth and bones) • Used to treat jaundice ( in some new born babies. • Too much can cause skin cancer. • Use sun block to protect against (UV rays)
- 29. Ultraviolet • Ultravioletradiation is emitted by the Sun and are the reason skin tans and burns. "Hot" objects in space emit UV radiation as well.
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- 33. XX--rraayyss • Shorterwavelength and higher frequency than UV-rays • Carry a great amount of energy • Can penetrate most matter. • Bones and teeth absorb x-rays. (The light part of an x-ray image indicates a place where the x-ray was absorbed) • Too much exposure can cause cancer – (lead vest at dentist protects organs from unnecessary exposure) • Used by engineers to check for tiny cracks in structures. – The rays pass through the cracks and the cracks appear dark on film.
- 34. X-ray • Adentist uses X-rays to image your teeth, and airport security uses them to see through your bag. Hot gases in the Universe also emit X-rays.
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- 37. GGaammmmaa rraayyss •Shorterwavelength and higher frequency than X-rays •Carry the greatest amount of energyand penetrate the most. •Used in radiation treatmentto kill cancer cells. •Can be very harmful if not used correctly.
- 38. Gamma ray •Doctors use gamma-ray imaging to see inside your body. The biggest gamma-ray generator of all is the Universe
- 39. GGaammmmaa rraayyss Gammaradiation
- 40. CREATE A CONCEPT MAP • Create a concept map about EM waves and speed of light.
- 41. 3-2-1 EXIT CARD 3-What have you learned today? Explain. 2-What life lessons have you gained from the topic? 1-What MI Activity did you learn the most from?