Transcript EM Spectrum Introduction - Hicksville Public Schools / Homepage

OBJ: Given notes, activity sheet and video SWBAT explain how the
following EM waves are helpful or harmful: radio waves, microwaves,
infrared, visible light, UV, X-rays and gamma rays with 70% accuracy.
DN: HW check- Interaction of Waves Booklet;
Watch EM Spectrum Video
ACT:
1] Introduction to Electromagnetic Wave Spectrum
2] Benefits / Dangers of: radio waves, microwaves, infrared, visible light,
ultraviolet (UV), X-rays, gamma rays
Text, read p. 74-81
Work on Waves of the Electromagnetic Spectrum Booklet
HW: Complete Waves of the Electromagnetic Spectrum Booklet; Study
for SVQ1 Quiz (absorb-environment); Work on WES Review Sheets;
WES Exam, Nov 19.
Electromagnetic Spectrum
Radio waves: longest wavelength, lowest
frequency; TV, radio/stereo, entertainment
Microwaves: microwave oven- heat food
Cell phone communication
Radar- track planes, car speeding
Infrared (heat) Rays: heat lamps- food warmer
Infrared camera detects heat for:
Firefighting – locate victims
Satellites: study growth of forests, cloud
motion
Combat- see enemy in darkness (night vision
goggles)
Electromagnetic Spectrum
Visible Light:
white light = ROYGBIV; colors of the
rainbow, water prism demo
Ultraviolet (UV) Rays:
UV Lamp- kills bacteria
Small dose UV rays: stimulates skin to
produce Vitamin D (healthy bones & teeth)
High dose UV rays: skin cancer, damages
eyes
Electromagnetic Spectrum
X-Rays:
Low dose used to pictures of bones (human skeleton)
and teeth;
CATscan (3D x-rays) used to make images of internal
organs.
High dose can cause cancer (dangerous)
Gamma Rays: shortest wavelength, highest frequency;
Low Dose radiation treatment: kills breast cancer
cells
Astronomy: view exploding stars; gamma ray bursts,
black holes
High Dose nuclear explosion: radiation sickness &
death