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PPT On Electromagnetic Spectrum

Published in: Physics
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#IGCSE #physics #0625 #electromagnetic spectrum

Nicole T / Kuching

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Teaches: English, Mathematics, Science, Bahasa Melayu, Chemistry, Physics, Additional Math, Modern Maths, Mandarin, Bahasa Malaysia

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  1. coss PHYSICS - The Electromagnetic Spectrum
  2. Core •Give a qualitative account of the dispersion of light as shown by the action on light of a glass prism including the Seven colours of the spectrum in their correct order Describe the main features of the electromagnetic spectrum in order Of wavelength • State that all e.m. waves travel with the Same high speed in a vacuum • Describe typical properties and uses of radiations in all the different regions of the electromagnetic spectrum including: - r adio and television communications (radio waves)- s atellite television and telephones (microwaves) - e lectrical appliances, remote controllers for televisions and intruder alarms (infra-red) - medicine and security (X-rays) • Demonstrate an awareness of safety issues regarding the use of microwaves and X-rays LEARNING OBJECTIVES Supplement Recall that light of a single frequency is described as monochromatic State that the speed Of electromagnetic waves in a vacuum is 3.0 x 108 m / s and is approximately the same in air
  3. Refraction of light by a prism. White light
  4. Refraction of light by a prism. Refraction
  5. Refraction of light by a prism.
  6. Refraction of light by a prism. This effect is called dispersion
  7. Refraction of light by a prism. This effect is called dispersion
  8. Refraction of light by a prism. This effect is called dispersion It happens because white is a mixture of all the colours in the rainbow
  9. Wavelength and colour White light is made up of different colours with wavelengths ranging from 0.0004mm (violet) to O.0007mm (red).
  10. Wavelength and colour White light is made up of different colours with wavelengths ranging from 0.0004mm (violet) to O.0007mm (red). Lasers, however, only emit light of a single colour and wavelength. This type of light is known as monochromatic light.
  11. Core •Give a qualitative account Of the dispersion of light as shown by the action on light of a glass prism including the seven colours Of the spectrum in their correct order Describe the main features of the electromagnetic spectrum in order of wavelength • State that all e.m. waves travel with the Same high speed in a vacuum • Describe typical properties and uses of radiations in all the different regions of the electromagnetic spectrum including: - r adio and television communications (radio waves)- s atellite television and telephones (microwaves) - e lectrical appliances, remote controllers for televisions and intruder alarms (infra-red) - medicine and security (X-rays) • Demonstrate an awareness of safety issues regarding the use of microwaves and X-rays LEARNING OBJECTIVES Supplement Recall that light Of a single frequency is described as monochromatic State that the speed Of electromagnetic waves in a vacuum is 3.0 x 108 m / s and is approximately the same in air
  12. The Electromagnetic Spectrum
  13. The Electromagnetic Spectrum RADIO WAVES MICROWAVES X-RAYS GAMMA RAYS
  14. The Electromagnetic Spectrum RADIO WAVES MICROWAVES Features of the electromagnetic spectrum X-RAYS GAMMA RAYS . They can travel through a vacuum (eg. Space)
  15. The Electromagnetic Spectrum RADIO WAVES MICROWAVES Features of the electromagnetic spectrum X-RAYS GAMMA RAYS . They can travel through a vacuum (eg. Space) 2. In a vacuum they travel at a speed of 300 000 kilometres per second.
  16. The Electromagnetic Spectrum RADIO WAVES MICROWAVES Features of the electromagnetic spectrum X-RAYS GAMMA RAYS 2. 3. They can travel through a vacuum (eg. Spac In a vacuum they travel at a speed of 300 000 kilometres per second. They are all transverse waves, with oscillations at right angles to the direction
  17. The Electromagnetic Spectrum RADIO WAVES MICROWAVES Features of the electromagnetic spectrum X-RAYS GAMMA RAYS . They can travel through a vacuum (eg. Space) In a vacuum they travel at a speed of 300 000 2. kilometres per second. They are all transverse waves, with 3. oscillations at right angles to the direction of travel. Electromagnetic waves transfer energy. 4.
  18. The Electromagnetic Spectrum Wavelength GAMMA RAYS RADIO WAVES 104 10-1 MICROWAVES 10-3 10-6 10-7 X-RAYS 10-9 10-11 10-14
  19. The Electromagnetic Spectrum Frequency GAMMA RAYS RADIO WAVES 105 1010 MICROWAVES 1012 1014 1015 X-RAYS 1017 1022
  20. 104 10-7 IOS 1010 1012 1022 Wavelengths decrease going along the EM spectrum from radio waves to gamma rays. Frequencies increase going along the EM spectrum from radio waves to gamma rays.
  21. 104 10-7 IOS 1010 1012 1022 Wavelengths decrease going along the EM spectrum from radio waves to gamma rays. Frequencies increase going along the EM spectrum from radio waves to gamma rays. have the lowest frequency and the least energy, and gamma ray photons have the highest frequency and the most energy.
  22. The Electromagnetic Spectrum Intensity and distance Whenever radiation is absorbed by matter, photons transfer their energy to the matter.
  23. The Electromagnetic Spectrum Intensity and distance Whenever radiation is absorbed by matter, photons transfer their energy to the matter. The energy deposited by a beam of electrons depends upon the number of photons and the energy of each photon.
  24. The Electromagnetic Spectrum Intensity and distance Whenever radiation is absorbed by matter, photons transfer their energy to the matter. The energy deposited by a beam of electrons depends upon the number of photons and the energy of each photon. The intensity of radiation means how much energy arrives at each square metre of surface second (W/m2).
  25. The Electromagnetic Spectrum Intensity and distance Whenever radiation is absorbed by matter, photons transfer their energy to th matter. The energy deposited by a beam of electrons depends upon the number of photons and the energy of each photon. The intensity of radiation means how much energy arrives at each square metre of surface per second (W/m2). The intensity of a beam of radiation decreases with distance from the source.
  26. The Electromagnetic Spectrum Intensity and 1. 2. The beam gets spread out The beam gets partially absorbed as it travels. distance Whenever radiation is absorbed by matter, photons transfer their energy to th matter. The energy deposited by a beam of electrons depends upon the number of photons and the energy of each photon. The intensity of radiation means how much energy arrives at each square metre of surface per second (W/m2). The intensity of a beam of radiation decreases with distance from the source.
  27. The Electromagnetic Spectrum and ionisation
  28. The Electromagnetic Spectrum and ionisation Some hi h ener —g—gY-EM radiation (ultraviolet. X-rays and gamma rays) are known as ionising radiation because they have enough energy to remove an electron from an atom or molecule)
  29. The Electromagnetic Spectrum and ionisation Before ionisation photon Atom or molecule Some hi h ener —g—gY-EM radiation (ultraviolet. X-rays and gamma rays) are known as ionising radiation because they have enough energy to remove an electron from an atom or molecule)
  30. The Electromagnetic Spectrum and ionisation Before ionisation photon Atom or molecule Some hi h ener —g—gY-EM radiation (ultraviolet. X-rays and gamma rays) are known as ionising radiation because they have enough energy to remove an electron from an atom or molecule) After ionisation electro Chan The photon hits the atom or molecule, and removes an electron.
  31. The Electromagnetic Spectrum and ionisation Before ionisation photon Atom or molecule Some hi h ener —g—gY-EM radiation (ultraviolet. X-rays and gamma rays) are known as ionising radiation because they have enough energy to remove an electron from an atom or molecule) After ionisation Chan mol The photon hits the atom or molecule, and removes an electron. If cells are exposed to ionisin radiation, they can damage the DNA in the nucleus of the cell. This can mutations, and the cells divide cause constantly without control - this is cancer. Vecy high doses of ionising radiation can kill cells. Excessive exposure to UV radiation can lead to sunburn skin or even cancer. Increased exposure = more damage
  32. The Electromagnetic Spectrum and dangers
  33. The Electromagnetic Spectrum X - rays X-rays are used by radiographers in hospitals to check for broken bones. X-rays pass easily through flesh, but are absorbed by denser materials like bone and metal. X-ray imaging is also used in airports to check the contents of bags. Precautions: radiograhers wear lead aprons or stand behind concrete to protect themselves. and dangers
  34. The Electromagnetic Spectrum and dangers Microwaves X - rays X-rays are used by radiographers in hospitals to check for broken bones. X-rays pass easily through flesh, but are absorbed by denser materials like bone and metal. X-ray imaging is also used in airports to check the contents of bags. Precautions: radiograhers wear lead aprons or stand behind concrete to protect themselves. Microwaves are used to send signals between mobile phones and mobile phone masts. When you make calls on your mobile, your phone emits microwave radiation. Some of this is absorbed by your body and may cause heating of body tissues. This heating could result in medical conditions, possibly including cancer, but there is no conclusive evidence. Precaution: limit the amount of time you spend talking on a mobile phone!
  35. The Electromagnetic Spectrum RADIO WAVES MICROWAVES X-RAYS Uses GAMMA RAYS
  36. The Electromagnetic Spectrum Uses GAMMA RAYS RADIO WAVES Broadcasting Communications, Satellite transmissions MICROWAVES
  37. The Electromagnetic Spectrum Uses GAMMA RAYS RADIO WAVES Broadcasting Communications, Satellite transmissions MICROWAVES Cooking, Communications, Satellite transmissions
  38. The Electromagnetic Spectrum Uses GAMMA RAYS RADIO WAVES Broadcasting Communications, Satellite transmissions MICROWAVES Cookinl Communica Satellit transmiss Cooking, thermal imaging, short range communications, optical fibres, IV remote controls. security systems
  39. The Electromagnetic Spectrum Uses GAMMA RAYS RADIO WAVES Broadcasting Communications, Satellite transmissions MICROWAVES Cookinl Communica Satellit transmiss Coo mag. com apt re m sect Vision Photography Illumination
  40. The Electromagnetic Spectrum Uses GAMMA RAYS RADIO WAVES Broadcasting Communications, Satellite transmissions MICROWAVES Cookinl Communica Satellit transmiss Coo magi com phc apt re m sect X-RAYS Security marking, Fluorescent lamps, Detecting foraed bank notes, Disinfecting water
  41. The Electromagnetic Spectrum Uses GAMMA RAYS RADIO WAVES Broadcasting Communications, Satellite transmissions MICROWAVES Cookinl Communica Satellit transmiss X-RAYS Observing the Coo mag. co m opt re m sect Securit' internal structure Pho Fluoresc Detecti of objects, Airport security banl• scanners, Disinfec Medical X-rays
  42. The Electromagnetic Spectrum RADIO WAVES Broadcasting Communications, Satellite transmissions MICROWAVES Cookinl Communica Satellit transmiss X-RAYS Coo magi com apt re m sect Observing the Securit' internal structure pho Fluoresc Detecti of objects, Airport security bank scanners, Disinfec Medical X-rays Uses GAMMA RAYS Sterilising food and medical equipment, Detection of cancer and its treatment.
  43. Core •Give a qualitative account Of the dispersion of light as shown by the action on light of a glass prism including the seven colours Of the spectrum in their correct order Describe the main features of the electromagnetic spectrum in order Of wavelength • State that all e.m. waves travel with the Same high speed in a vacuum • Describe typical properties and uses of radiations in all the different regions of the electromagnetic spectrum including: - r adio and television communications (radio waves)- s atellite television and telephones (microwaves) - e lectrical appliances, remote controllers for televisions and intruder alarms (infra-red) - medicine and security (X-rays) • Demonstrate an awareness of safety issues regarding the use of microwaves and X-rays LEARNING OBJECTIVES Supplement Recall that light Of a single frequency is described as monochromatic State that the speed Of electromagnetic waves in a vacuum is 3.0 x 108 m / s and is approximately the same in air
  44. coss PHYSICS - The Electromagnetic Spectrum
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