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em_spectrum_reprt (1).pptx

  1. 1. EM SPECTRUM: INFRARED & VISIBLE LIGHT GROUP 3 STE-10
  2. 2. EM SPECTRUM
  3. 3. What is EM Spectrum?
  4. 4. Description of EM Spectrum The electromagnetic spectrum is the range of frequencies of electromagnetic radiation and their respective wavelengths and photon energies. – wikipedia
  5. 5. Description of EM Spectrum The electromagnetic spectrum is a continuum of electromagnetic waves arranged according to frequency and wavelength. It is a gradual progression from the waves of lowest frequencies to the waves of highest frequencies. According to increasing frequency, the EM spectrum includes: radio waves, microwaves, infrared, visible light, ultraviolet, X-rays, and gamma rays. These waves do not have exact dividing region.
  6. 6. USES OF EM SPECTRUM Electromagnetic waves have a vast range of practical everyday applications that includes such diverse uses as communication by cell phone and radio broadcasting, WiFi, cooking, vision, medical imaging, and treating cancer.
  7. 7. Because Gamma rays can kill living cells, they are used to kill cancer cells without having to resort to difficult surgery. This is called "Radiotherapy", and works because healthy cells can repair themselves fairly well when damaged by gamma rays - but cancer cells can't. EM Spectrum in Treating Cancer
  8. 8. ●Electromagnetic radiation includes everything from gamma rays to visible light to radio waves. Your laptop/tablet/etc. uses a wireless adapter to translate data into a radio signal and transmit that signal using an antenna. Those radio waves emanate outwards from the antenna and are received by your wireless router. EM Spectrum on Wireless Connections
  9. 9. EMR has very beneficial uses of our daily life to make it more comfortable and easier. Nowadays, we can talk to anyone on a mobile phone through the Internet: it is because of EMR, since these waves can transmit signals for very long distances. So EMR has the key roles in making our lives more comfortable.- Over-exposure to certain types of electromagnetic radiation can be harmful. The higher the frequency of the radiation, the more damage it is likely to cause to the body: microwaves cause internal heating of body tissues. Infrared radiation is felt as heat and causes skin to burn. EM SPECTRUM ADVANTAGES DISADVANTAGES
  10. 10. Frequency and wavelength are inversely proportional to each other. The wave with the greatest frequency has the shortest wavelength. Twice the frequency means one-half the wavelength. For this reason, the wavelength ratio is the inverse of the frequency ratio. Frequency and Wavelength
  11. 11. Infrared Light
  12. 12. In the year 1800, Sir William Herschel was exploring the question of how much heat was contained by the different colors of visible light. He devised and experiment where he used a glass prism to separate sunlight into it's rainbow of colors. Then, he placed a thermometer under each color, with one extra thermometer just beyond the red light of the spectrum. He found that the thermometer that was seemingly out of the light had the highest temperature. Thus, he discovered infrared light.
  13. 13. Infrared waves, or infrared light, are part of the electromagnetic spectrum. People encounter Infrared waves every day; the human eye cannot see it, but humans can detect it as heat. A remote control uses light waves just beyond the visible spectrum of light—infrared light waves—to change channels on your TV. Infrared Light
  14. 14. Characteristics of Infrared Lights Infrared waves have longer wavelengths than visible light and can pass through dense regions of gas and dust in space with less scattering and absorption. Thus, infrared energy can also reveal objects in the universe that cannot be seen in visible light using optical telescopes.
  15. 15. Uses of Infrared Light Infrared radiation can promote local blood circulation and reduce muscle tension. Examples of traditional medical applications of infrared radiation include the relief of muscle pain and tension, as well as the treatment of autoimmune diseases or wound-healing disorders.
  16. 16. ADVANTAGE OF INFRARED LIGHT Infrared therapy has many roles in the human body. These include detoxification, pain relief, reduction of muscle tension, relaxation, improved circulation, weight loss, skin purification, lowered side effects of diabetes, boosting of the immune system and lowering of blood pressure.
  17. 17. DISADVANTAGE OF INFRARED LIGHT Prolonged exposure to IR radiation causes a gradual but irreversible opacity of the lens. Other forms of damage to the eye from IR exposure include scotoma, which is a loss of vision due to the damage to the retina. Even low-level IR absorption can cause symptoms such as redness of the eye, swelling, or hemorrhaging.
  18. 18. Visible Light
  19. 19. This range in wavelengths in the Visible Light Spectrum was discovered by Isaac Newton in the 17th century, although there is further knowledge that it had been discovered four centuries earlier in the 13th century by Roger Bacon. Visible light is the only part of the Electromagnetic Spectrum humans can detect.
  20. 20. It was discovered by Isaac Newton in 1665 by taking Roger Bacon's discovery of visible light by looking through a glass of water, a little farther as he tried the experiment more and finally wrote his thoughts down about the rainbow colors he saw through a prism. In 1665, Isaac Newton, then a young scientist at Cambridge University in England, took a glass prism and held it up to a beam of sunlight streaming through the window. He saw the sunlight that passed through the prism spread out into the colors of the rainbow - red, orange, yellow, green, blue and violet.
  21. 21. ● Light or "visible light" refers to the visible region of the electromagnetic spectrum – that is, the range of wavelengths that trigger brightness and colour perception in humans. It lies between UV and infrared radiation. ● Some other sources of visible light include: television and computer screens, glow sticks, and fireworks. Visible Light
  22. 22. The most important characteristics of visible light are colour which is both an inherent property of light and an artifact of the human eye. Our eyes include specialized cells known as cones. These cones act as receivers that are tuned to the wavelength of the narrowband of the EM spectrum. Characteristic of Visible Light
  23. 23. Visible light is the light we can see, so is used in photography and illumination. It is also used in fibre optic communications, where coded pulses of light travel through glass fibres from a source to a receiver. Uses of Visible Light
  24. 24. Visible Light in Optic Communication ● Visible light sources are now being used in this field, bringing advantages in both visibility and workability. In particular, current trends and subjects affecting the key devices used in these networks, such as visible light sources, optical fibers, optical circuits and transceiver modules, are explained. ● coded pulses of light travel through glass fibres from a source to a receiver.
  25. 25. Visible Light in Photography and Illumination ● Visible cameras utilize wavelengths of light from 400~700nm, which is the same spectrum that the human eye perceives. Visible cameras are designed to create images that replicate human vision, capturing light in red, green and blue wavelengths (RGB) for accurate color representation.
  26. 26. Visible Light in Photosynthesis ● Light energy enters the process of photosynthesis when pigments absorb the light. In plants, pigment molecules absorb only visible light for photosynthesis. The visible light seen by humans as white light actually exists in a rainbow of colors.
  27. 27. ADVANTAGE OF VISIBLE LIGHT Along with the given uses which are Visible Light’s advantage, Visible light helps humans to see, this is the most important advantage of visible light.
  28. 28. DISADVANTAGE OF VISIBLE LIGHT Visible light is essential for the perception and appreciation of art, but it, too, contributes to degradation and damage of objects. Irreversible damage caused by light can include color fading, yellowing, and embrittlement. Overexposure to visible light could harm the human eyes, some materials could undergo deterioration due to chemical changes.
  29. 29. https://www.europeanreview.org/wp/wp-content/uploads/3121-3128.pdf https://www.bbc.co.uk/bitesize/guides/z66g87h/revision/4#:~:text=Over%2Dexposure%20to%20ce rtain%20types,and%20causes%20skin%20to%20burn https://www.physicsclassroom.com/class/waves/Lesson-2/The- WaveEquation#:~:text=Frequency%20and%20wavelength%20are%20inversely,inverse%20of%20the%20f requency%20ratio. https://science.nasa.gov/ems/07_infraredwaves#:~:text=Infrared%20waves%2C%20or%20infrared% 20light,change%20channels%20on%20your%20TV https://science.nasa.gov/ems/07_infraredwaves#:~:text=Infrared%20waves%20have%20longer%20w avelengths,visible%20light%20using%20optical%20telescopes. https://www.bfs.de/EN/topics/opt/visible- light/introduction/introduction.html#:~:text=Light%20or%20%22visible%20light%22%20refers,b etween%20UV%20and%20infrared%20radiation. https://sites.google.com/site/mrjhelectromagneticspectrum/home/visible- light#:~:text=The%20sun%2C%20light%20bulbs%2C%20candles,%2C%20glow%20sticks%2C%20and%20fir eworks. Sources

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