Chapter 23 – Light, Astronomical Observations and The Sun
1) Review Question (2 pt.)
What is the electromagnetic spectrum? What wavelength has the highest energy?
2) Review Question (2 pt.)
What can be learned about a star (or other celestial objects) from a dark-line/absorption spectrum?
3) Review Question (2 pt.)
Describe how astronomers determine whether a star is moving toward or away from Earth.
4) Review Question (2 pt.)
Why do astronomers seek to design telescopes with larger and larger mirrors? Why does the size of the mirror matter?
5) Website Learning (2 pts)
Check out the following website: http://www.explainthatstuff.com/electromagnetic-spectrum.html
Read through the information on the various wavelengths of the EM spectrum. Pick the ones that interest you the most! In 3-4 sentences describe two of the wavelengths and tell me what you learned, in your OWN words.
6) Review Question (5 pt.)
Describe the Sun in as much detail as you can…what does it look like, what features does it have, etc. Your description should be about 1-2 paragraphs and don’t use sources other than your textbook and lecture notes, summarizing what you have learned (in other words don’t got do an internet search, just show me what you have learned!).
7) Review Question (2 pt.)
Explain how a sunspot can be very hot and yet appear dark. Use your thinking caps!
8) Review Question (1 pt.)
What “fuel” does the Sun consume?
9) Lecture Review Question (1 pt)
What is the most inefficient method of heat transfer within the interior of the sun? Hint: Think about what the sun is made of….GAS! So what method of heat transfer is least efficient in a gas?
10) Astronomy & Earth Science: Bringing it together (6 pts, 2pts each)
Time to brainstorm a bit here, and bring in what you have learned so far in this class. Explain in detail (use your thinking caps!) a few ways that the sun is an important aspect of the following:
a) The Geosphere
b) The formation of the Solar System
c) The Biosphere
the solar wind
convection and radiation
conduction and radiation
convection and conduction
convection and ionizing
array of electrodes used on spacecraft to detect charged particles such as electrons and protons
detector in which a small electric current is controlled by a bimetallic strip that expands and contracts in response to infrared radiation
array of small light-sensitive cells that can be used in place of photographic film to obtain a picture
electronic filter to single out one wavelength or set of wavelengths for studying astronomical objects
Visible light is not part of the electromagnetic spectrum
Visible light takes up only a very small part of the total range of wavelengths in the electromagnetic spectrum
Visible light takes up most (but not all) of the total range of wavelengths in the electromagnetic spectrum
Visible light takes up all of the electromagnetic spectrum
The gas particles are too big, they have large diameters
The gas particles are heavy
The gas particles are packed very dense in the Sun
The gas particles put on their cloaking devices.
combination of many small plane mirrors
prism of glass
the Doppler principle
Kepler’s first law
the Stefan-Boltzmann law
focal length of the mirror or lens
area of the mirror or lens
image quality of its optics
length of the telescope tube
thermonuclear fission (splitting) of heavy elements into hydrogen.
chemical burning of hydrogen gas with oxygen.
thermonuclear fusion (combining) of hydrogen atoms.
The Sun is normal, main sequence star
The Sun is the closest Star to Earth
The Sun used fusion to fuel itself
The Sun is smaller in diameter than Jupiter, the largest planet in our Solar System
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