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ELECTROMAGNETIC (EM) SPECTRUM

ELECTROMAGNETIC (EM) SPECTRUM. March 17-18, 2014. How long is each wavelength?. http:// science.hq.nasa.gov/kids/imagers/ems/index.html. Radiowaves. Longest wavelength Low frequencies AM- modify amplitude Long distance communication

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ELECTROMAGNETIC (EM) SPECTRUM

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  1. ELECTROMAGNETIC (EM) SPECTRUM March 17-18, 2014

  2. How long is each wavelength? http://science.hq.nasa.gov/kids/imagers/ems/index.html

  3. Radiowaves • Longest wavelength • Low frequencies • AM- modify amplitude • Long distance communication • Prone to signal interference (that fuzzy buzzing sound) • FM- modify frequency • Short distance communication • Less likely to be interfered with • Used in: • TVs, • Radios • Walkie Talkies • Negatives: • Very sensitive to electronic interference • Can’t go very far distances (won’t help us talk to people on the moon)

  4. Microwaves • Still long wavelength • Low frequencies • Long, long distance communication (like to outer space and back) • Used in: • Microwaves • Radar (speed guns) • Satellites • Cell phones • Negatives: Can they cause cancer?

  5. Infrared (IN-FRA- RED) • Comes from objects (every object has heat) • Main source: THE SUN!, lightbulbs • Is heat being absorbed and then released by objects • Need special equipment to see • Used: • Law enforcement (find the bad guys) • Warm yourself • Negatives: • Sunburn • Heat stroke (if absorb to much heat)

  6. Visible Light aka ROYG. BIV • Middle of the spectrum (smallest part though) • Lets us see • When all are together= white light • Negatives: • Damage eyes • Can come from light sources like: • The sun • Lamps

  7. Ultraviolet aka UV • From sun, lamps, basically any light source • Used for: • Sterilization • Vitamin D production= calcium absorption (healthy bones) • Happy moods • That lovely tan from the beach • Negatives: • Sunburn • Cancer if too much exposure • Eye damage

  8. X-rays • Second shortest wavelength • High frequency • Pass through almost anything (excluding some elements like Lead (Pb)) • Used for: • Security • Medical observation • Negatives: • Too much = mutation of cells • Kill healthy cells

  9. Gamma Rays • Shortest wavelength • Highest frequencies • Can pass through anything • Used for: • Killing germs/bacteria in food • Nuclear medicine (cancer treatments, thyroid treatments, etc…) • Negatives: • Kill/damage cells • Can be left over from nuclear explosions • Mutations! Ahhhh!

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