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PSU Astro 7N Exam 2 With Complete answers_100- sure_.pdf
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8/22/24, 3:29 PMPSU Astro 7N Exam 2
Jeremiah
Practice questions for this set
Terms in this set (115)
Hydrogen and Helium What gases make up the sun?
Magnetic Activity What causes sunspots?
Helium-4 What is made from 4 protons during fusion in the sun?
Step 1 of P-P Chain
Deuterium Nucleus (and released energy)
What forms when two protons collide at very high speeds?
Step 2 of P-P Chain
Helium-3 Nucleus
When deuterium and a proton collide it makes this
Helium-4 Nucleus (and 2 protons and Step 3 of P-P Chain
PSU Astro 7N Exam 2
Deuterium 1 proton and 1 neutron bound together
Helium-3 2 protons and 1 neutron
Helium-4 2 protons and 2 neutrons
Central part of sun
High density and temperature
Core
Nuclear reactions occur here
Gamma rays are produced here
Region in sun
Radiative Zone
Photons are re-absorbed and re-emitted
Region of the sun where gases circulate
Convective Zone
Light takes a week to get through
Photosphere The surface of the sun that we see
Red/orange
Chromosphere
We see through it
Flare An eruption coming out of the sun due to magnetic activity
Prominence Hoop-shaped eruption out of the sun due to magnetic activity
Outer layer of sun
Corona Low density
Only visible during solar eclipses
The true brightness of the star
Luminosity
The absolute power output
Brightness Apparent output of something observed at a certain distance
Inverse-Square Law B=L/(4pi(d^2))
If star A is (X) times as luminous as star B, then stars A and B would appear equally
4
bright if star A were 2 times as far away as star B
D=1/p
Parallax Method D= Distance in parsecs
p= Parallax angle in arc seconds (1/3600)
energy) Two Helium-3 nuclei combine to make this
Red What color are cooler stars?
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Blue What color are hotter stars?
OBAFGKM The temperature sequence (from hot to cold) of spectral classes
The closest star to our solar system other than the sun
Alpha Centauri
4.3 light years away
Sirius (Dog Star) Brightest star in the sky
Which stars are located on the lower right of the HR Diagram?
Red Dwarfs
Cool, faint, small
Which stars are located on the upper left of the HR Diagram?
Blue Giants
Hot, bright, large
Not on the main sequence
Burning helium and other elements in their cores (not hydrogen)
Starting to die
Red Giants/Supergiants
Large and very luminous
Cooler
Top right of HR DIagram
PSU Astro 7N Exam 2
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