ch. 19 - light
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Ch. 19 - Light. I. Electromagnetic Radiation (p.528-535) EM Radiation EM Spectrum Types of EM Radiation. A. EM Radiation. Electromagnetic Radiation transverse waves produced by the motion of electrically charged particles does not require a medium speed in a vacuum = 300,000 km/s - PowerPoint PPT PresentationTRANSCRIPT
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Ch. 19 - Light
I. Electromagnetic Radiation (p.528-535)
EM RadiationEM SpectrumTypes of EM Radiation
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A. EM Radiation
Electromagnetic Radiationtransverse 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
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A. EM Radiation
Photonstiny, particle-like
bundles of radiationabsorbed and released
by electronsenergy increases with wave
frequency
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B. EM Spectrum
long
low f
low energy
short
high f
high energy
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C. Types of EM Radiation
Radiowaveslowest energy EM radiation
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C. Types of EM Radiation
RadiowavesFM - frequency modulation AM - amplitude modulation
Microwavespenetrate food and vibrate
water & fat molecules to produce thermal energy
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C. 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
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C. Types of EM Radiation
Visible Lightsmall part of
the spectrum we can see
ROY G. BIV - colors in order of increasing energy
R O Y G. B I V
red orange yellow green blue indigo violet
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C. Types of EM Radiation
Ultraviolet Radiation (UV)slightly higher energy than visible lightTypes:
• UVA - tanning, wrinkles• UVB - sunburn, cancer• UVC - most harmful,
sterilization
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C. Types of EM Radiation
Ultraviolet Radiation (UV)Ozone layer depletion = UV exposure!
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C. Types of EM Radiation
X rayshigher energy than UVcan penetrate soft tissue,
but not bones
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C. Types of EM Radiation
Gamma rayshighest energy
EM radiationemitted by
radioactive atomsused to kill
cancerous cells Radiation treatment using radioactive cobalt-60.