Presentation on theme: "ELECTROMAGNETIC (EM) SPECTRUM March 17-18, 2014. How long is each wavelength?"— Presentation transcript:
ELECTROMAGNETIC (EM) SPECTRUM March 17-18, 2014
How long is each wavelength?
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)
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?
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)
Visible Light aka ROY G. 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
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
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
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!