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Electromagnetic Spectrum

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by

Sean Tsui

on 4 February 2014

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Transcript of Electromagnetic Spectrum

Intro to the EMS
Travels in waves and has broad spectrum, long radio waves to short gamma rays

Humans only see a small portion called light, there are tons of more types of energy in the spectrum.
Microwaves
"band"

Medium length
(c-band) microwaves penetrate through dust, smoke, snow, etc

Passive remote sensing
- = sensing of electromagnetic waves

Microwaves
can pass through clouds which enables them to monitor condition below hurricanes.
Color Map
- data set, temperature data

Natural Color Image
- captures visible light data to create natural color

False/Representative Color
- used to help visualize data from wavelength
Mechanical Waves
-waves in water/sound & caused by disturbance in matter
Light is made out of "
photons
"
Photons carry momentum, no mass, same speed as light

Electromagnetic Energy
-
can be shown as Frequency/ Wavelngth/ energy

Electromagnetic Spectrum
Radio Waves
Longest wavelengths in the electromagnetic spectrum
Electromagnetic Energy
Anatomy of Electromagnetic Wave
Vizualization
Microwaves
-
portion/band, found at high frequency end of radio spectrum
Radio Emissions -
emissions from sources, like radio bursts from sun
Can be measured up to the length of a football up to lengths larger than earth.
Radio Telescopes -
Huge telescopes that study the
planets, comets, stars, etc. by studying their radio waves
Infrared Waves
Discovery -
William Herschel measured temp.
of all colors, at red end was warmest, infrared light

Infrared Energy = Heat
visible = Night vision goggles
or infrared cameras
& it`s invisible with naked eyes
Cool Astronomy -
Things in universe too cool/faint,
only detected by IR waves
higher temp -
Bluish
color
Lower temp -
yellowish
/
reddish
color
The sun
= source for visible light waves
(the eye receives)

Corona
= outer layer of the sun

The color of stars tell about their temperature of the Sun.

Absorption
- pattern of dark lines


Visible Light
UltraViolet Waves

Source
=
Sun

UV-C>UV-B>UV-A
X-Rays
- have very small wavelengths,(0.03~3nanometers)
shorter wavelength and higher energy than UV light.

X-rays were 1st observed/tested by German scientist "Wilhelm Conrad" in
1895
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
X-rays can take detailed images of bones, since it's dense
Physical temp of object determines the wavelength it emits.

X_X-Rays
Aurorae
High Energy waves travel along magnetic poles
UV Astronomy
scientists study formation of stars
since they shine at these wavelengths
GAMMA RAYS

Smallest Wavelengths
Most Energy

– So small can pass through space between atoms
– Detected by thing called Compton Scattering
Gamma Ray Bursts
Super Strong energy that can be produced in 10 seconds when sun takes 10 bil. yrs.
– used to detect elements on other planets

Full Spectrum Image
Gamma Rays
Sean Tsui
&
Asakaze
Nishimura
Full transcript