Green Lab 05
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School
University of North Carolina, Chapel Hill *
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Course
101
Subject
Astronomy
Date
Dec 6, 2023
Type
docx
Pages
2
Uploaded by CorporalCapybaraPerson489
Name: Zavier Green
Date: 9/30/23
Lab 05: Blackbody Spectrum
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name, lab number (e.g., “newtoni-lab05”).
Bright Objects
Table 1
Wavelength
Temperature
Wavelength
(nm)
Region of
Spectrum
Kelvin
Fahrenheit
Sirius A
290
UV
10000
17540.33
Sun
483
V
6000
10340.33
Light Bulb
980
IV
2950
4850.33
Human Vision
Shortest wavelength:
nm
Longest wavelength:
nm
Questions
1)
Which two of the three objects in Table 1 have their peak intensity outside the visible
part of the spectrum?
Answer
:
Sirius A and the lightbulb are both outside of the visible light spectrum.
2)
We can see all three objects clearly in the visible part of the spectrum, even though
the peak intensity might lie outside that region.
Why is this so?
Answer
:
In all of these objects there are elements of visible light that are given off
and THAT is what we can see. Just because they are mostly infrared or ultraviolet
does not mean they don’t have visible light in them.
3)
How is the wavelength of the most intense emission related to surface temperature?
Answer
:
The surface temp and the emissions each have an inverse relationship.
We know this by using Wiens law of displacement.
4)
At what wavelength does the Sun emit its most intense radiation?
The Sun usually
appears yellow to the human eye.
What is the wavelength for yellow light?
Are
these the same or not?
How is this related to the normal limits of human vision?
Answer
:
Around 555 nm, yellow is 570 nm, these are close but not exactly the
same. This is related as our human eyes are only able to detect a small range of
lights that are emitted. The sun happens to fall in the middle of this range.
5)
Astronomers searching for planets orbiting other stars are particularly interested in
finding Earthlike planets in the habitable zone around stars, where liquid water could
theoretically exist.
What are major problems astronomers face in observing such
planets directly?
Answer
:
A major problem is that if you were to look at earth from millions of light
years away the shear size of the sun would make it almost impossible to see
earth as its very very very close to the sun. This might be a problem for us if were
trying to look outwards to other stars.
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