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Title:

Light and Electromagnetic Energy

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Title: Light and Electromagnetic Energy Author: SCC Last modified by: mutz Created Date: 1/26/2001 5:18:59 PM Document presentation format: On-screen Show (4:3) – PowerPoint PPT presentation

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Title: Light and Electromagnetic Energy


1
Light and Electromagnetic Energy
2
The Particle-like nature of light
3
Light travels in packets called Photons
4
The Wave-like nature of light
5
Wavelength, l
c lf
f frequency, per second (Hz) c the speed of
light, 300,000 km/s
6
  • The
  • Electromagnetic
  • Spectrum

7
1 nm 1 nanometer 10-9 meters
Microwaves
Blue
Orange
Green
Yellow
violet
Red
8
Plancks Law Energy of a photon hc/l h
Plancks constant c speed of light l
wavelength
9
Astronomical Instruments
10
The main purposes of a Telescope 1. Gather
Light 2. Increase Resolution 3. Magnify the
image
11
Two main types of Optical Telescopes Refracting
- uses a lens to bend light Reflecting - uses a
mirror
12
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13
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14
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15
Observatory Considerations
16
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17
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18
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19
Why not an observatory here?
20
Accessibility/Weather
21
Mauna Kea, Hawaii
22
Keck twin 10 meter telescopes
23
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24
Mt. Palomar 200
25
Hubble Space Telescope
26
Advantages Above the atmosphere -gt no seeing
effects -gt no absorption -gt weather-proof -gt
its always nighttime!
27
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28
Radio Telescopes
29
Green Bank , West Virginia
30
Arecibo, Puerto Rico
31
The Very Large Array, New Mexico
Interferometry
32
Radio Source Cygnus A
33
The Center of our Galaxy
34
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35
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36
Chandra X-ray Telescope
37
M82 -Optical
38
M82 - Radio
39
M82 - Xray
40
Astronomical Detectors - The Human Eye -
Photographs (1840) - CCDs (1980)
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