Astronomy 113
Homework 4, Due on Wednesday, Oct. 30 at the beginning of class.
Be sure to show your work, do your own work, and put your name and
row letter on it and write legibly. If I can't read it, I can't grade it.
Do on your own paper- do not turn in any images.
If an answer is numerical you must show the equation for credit.
1) What is the most common type of planet discovered?
A) Earth-like at Earth-like distances
B) Jupiter-like at short (Mercury-like) orbits.
C) Jupiter-like at long, (Jupiter-like) orbits.
D) Sized between Earth and Neptune with short orbits.
E) Earth-like at long, (Jupiter-like) orbits.
For Questions 2 - 6, match the energy source with the stage of evolution.
A) Fusion H -> He
B) Fusion He -> C/O
C) Gravity
D) Electron degeneracy pressure
E) Neutron degeneracy pressure
F) Explosion (supernova)
2) Protostar.
3) Neutron star.
4) Main sequence star.
5) White dwarf star.
6) Red giant star.
7) Order the groups of stars from youngest to oldest. (Just list the letters.)
8) What is the Schwarzchild radius of a 16MSun black hole?
9) How will a 10 MSun star end?
10) In the above image, what's the difference between stars near A and stars near B
that causes them to be where they are in the HR diagram? (What's the reason behind
their position.)
11) In the above image, what's the difference between stars near C and stars near B
that causes them to be where they are in the HR diagram? (What's the reason behind
their position.)