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Electromagnetic Spectrum

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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.

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

Passive remote sensing
- = sensing of electromagnetic waves

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 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
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 -
Lower temp -
The sun
= source for visible light waves
(the eye receives)

= outer layer of the sun

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

- pattern of dark lines

Visible Light
UltraViolet Waves


- 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
X-rays can take detailed images of bones, since it's dense
Physical temp of object determines the wavelength it emits.

High Energy waves travel along magnetic poles
UV Astronomy
scientists study formation of stars
since they shine at these wavelengths

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
Full transcript