Presentation on theme: "I. Electromagnetic Radiation (p )"— Presentation transcript:
1I. Electromagnetic Radiation (p.528-535) Ch LightI. Electromagnetic Radiation (p )EM RadiationEM SpectrumTypes of EM Radiation
2A. EM Radiation Electromagnetic Radiation transverse waves produced by the motion of electrically charged particlesdoes not require a mediumspeed in a vacuum = 300,000 km/selectric and magnetic components are perpendicular
3A. EM Radiation Photons tiny, particle-like bundles of radiation absorbed and released by electronsenergy increases with wave frequency
4B. EM Spectrumlong low flow energyshort high fhigh energy
5C. Types of EM RadiationRadiowaveslowest energy EM radiation
6C. Types of EM Radiation Radiowaves FM - frequency modulation AM - amplitude modulationMicrowavespenetrate food and vibrate water & fat molecules to produce thermal energy
7C. Types of EM Radiation Infrared Radiation (IR) slightly lower energy than visible lightcan raise the thermal energy of objectsthermogram - image made by detecting IR radiation
8C. Types of EM Radiation Visible Light small part of the spectrum we can seeROY G. BIV - colors in order of increasing energyROYG.BIVredorangeyellowgreenblueindigoviolet
9C. Types of EM Radiation Ultraviolet Radiation (UV) slightly higher energy than visible lightTypes:UVA - tanning, wrinklesUVB - sunburn, cancerUVC - most harmful, sterilization
10C. Types of EM Radiation Ultraviolet Radiation (UV) Ozone layer depletion = UV exposure!
11C. Types of EM Radiation X rays higher energy than UV can penetrate soft tissue, but not bones
12Radiation treatment using radioactive cobalt-60. C. Types of EM RadiationGamma rayshighest energy EM radiationemitted by radioactive atomsused to kill cancerous cellsRadiation treatment using radioactive cobalt-60.