BELLRINGER
On your BR page, draw this wave and correctly label the
components labeled A – D. (It should be in your notes from yesterday)
BELLRINGER
A.
B.
C.
D.
Crest
Trough
Amplitude
Wavelength
AGENDA
Today:
The EM Spectrum:
- Review of yesterday’s info
- EM. Spectrum Notes
- Begin EM Spectrum Foldable/Booklet (due complete and
correct before any Jedi signatures will be given)
Tomorrow:
- First ½ - Finish foldable
- Second ½ - Kahoot (EM waves, spectrum (Only for those finished
with foldable))
REVIEW FROM YESTERDAY
Which of the following waves has the longest wavelength?
REVIEW FROM YESTERDAY
Which of the following waves has the longest wavelength? B
REVIEW FROM YESTERDAY
Which of the following waves would have the highest frequency?
REVIEW FROM YESTERDAY
Which of the following waves would have the highest frequency? A
REVIEW FROM YESTERDAY
Which wave has the greatest energy (and therefore most likely to
cause harmful radiation)?
REVIEW FROM YESTERDAY
Which wave has the greatest energy (and therefore most likely to
cause harmful radiation)? A, because it would hit you with the most
waves per second. Remember, energy of a wave = # of waves
hitting you per second.
THE ELECTROMAGNETIC SPECTRUM
(NOTES ON PAGE 41)
Depending on the frequency and therefore wavelength and
energy, a wave falls somewhere along a spectrum.
THE ELECTROMAGNETIC SPECTRUM
(NOTES ON INB 41)
Depending on the frequency and therefore wavelength and
energy, a wave falls somewhere along a spectrum.
THE ELECTROMAGNETIC SPECTRUM
We use many of these waves for modern technology.
RADIO
(LONGEST WAVES = LOWEST ENERGY)
• Emitted by:
• Astronomical Objects
• Radio and TV Station Transmitters
• Detected by:
• Ground based radio telescopes
• Radio receivers
• *If you turn on a radio, it will
convert the radio wave energy
into sound energy.
MICROWAVES
• Higher frequency (shorter
wavelength) than radio waves
• Emitted by:
• Microwave Ovens
• Cell Phones
• Gas clouds collapsing into stars
• Detected by
•
•
•
•
Food (heated)
Cell phones
Radar (systems)
Microwave Telescopes
INFRARED
(HEAT OR THERMAL)
ARE YOU A SOURCE OF INFRARED? YES YOU ARE!
• Emitted by
•
•
•
•
Sun and stars (Near)
TV Remote Controls
Food Warming Lights (Thermal)
Everything with thermal energy
emits these waves
• Detected by
• Infrared Cameras
• Your skin
• Snakes
VISIBLE LIGHT
• Emitted by
EACH COLOR IS A DIFFERENT SIZE WAVE.
RED THE LONGEST & VIOLET THE SHORTEST
• The sun and other astronomical
objects
• Light bulbs
• Anything that emits light
• Detected by
•
•
•
•
Cameras (film or digital)
Human eyes
Plants (red light)
Telescopes
ULTRAVIOLET (UV)
SUNBURN
• Emitted by
• Tanning booth
• The sun
• UV lamps
• Detected by
• Space based UV detectors
• UV Cameras
• Emitted by
•
•
•
•
Airport luggage scanners
X-ray machines
CAT scan machines
Radioactive minerals
• Detected by
• X-ray film and machines
• Space based X-ray detectors
• CCD detectors
X-RAYS
GAMMA RAYS
(VERY SHORT EM WAVES, BUT VERY ENERGETIC!)
Emitted by
• Radioactive materials
• Solar flares
• Exploding nuclear weapons
• Gamma-ray bursts
Detected by
• Medical imaging detectors
• Geiger counters
• Gamma detectors and satellites
EM. SPECTRUM BOOK
1. Turn to pg 633 in your book, and make the 8-layer book
shown.
1. Make sure you draw the EM spectrum on the outside as shown
on page 633 (low frequency at the top, getting higher as you go top
to bottom).
2. On each flap, fill in the following components:
1. “These waves have more energy than ___________ ,
but less energy than _____________.”
(Ex: Radio: “These waves have more energy than NONE, but less
energy than MICROWAVES.”)
2. 3 uses for that type of wave (can be found in notes, or section
16-3)
3. A picture of something that emits that wave
4. A picture of something that detects that type of
wave.