mirror of
https://asciireactor.com/otho/as-500.git
synced 2024-11-22 10:05:05 +00:00
37 lines
1.1 KiB
Plaintext
37 lines
1.1 KiB
Plaintext
Homework 12, due Oct 5
|
||
|
||
1) For the kinetic temperatures of a cluster of galaxies, T=3x10⁷ K, and for the Orion H II region, T=10⁴ K, what energy in eV does it correspond to?
|
||
|
||
T 3x10⁷ K 10⁴ K
|
||
Eₖₜ 2585.2 eV 0.86173 eV
|
||
|
||
|
||
2) What is the closest ionization stage of the six most common elements for those two temperatures, considering just the ionization energy?
|
||
|
||
|
||
|
||
Cluster Orion
|
||
|
||
Thermal Average Energy
|
||
────────────────────────
|
||
2585.2 eV 0.86173 eV
|
||
|
||
Near Ionization Stage
|
||
────────────────────────
|
||
H I H I
|
||
He II He I
|
||
O VIII O I
|
||
C VI C I
|
||
Ne X Ne I
|
||
Fe XXIV Fe I
|
||
|
||
We expect all of the elements to be ionized in the cluster, except iron.
|
||
|
||
|
||
3) Consider the very important case of H 2 , H 0 , and H + . What is the temperature needed to dissociate H 2 and form H 0 , and then to ionize H 0 ?
|
||
|
||
H₂[zero point] = -4.5 eV.
|
||
4.5 eV / kᵦ = 5.2×10⁴ K.
|
||
|
||
H⁰[zero point] = 13.6 eV.
|
||
13.6 / kᵦ = 1.58×10⁶ K. |