What information does 21-cm radiation provide about the gas clouds?
A) their motion
B) their density
C) their temperature
D) their distribution
E) all of the above
E
Physics & Space Science
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The energy level diagram for hydrogen
The ionization energy of hydrogen is
a.
1.5 eV.
b.
1.9 eV.
c.
3.4 eV.
d.
10.2 eV.
e.
13.6 eV.
Physics & Space Science
Why is ultraviolet light not transmitted by glass?
What will be an ideal response?
Physics & Space Science
Explain how the central engine powers an active nucleus or quasar
What will be an ideal response?
Physics & Space Science
Compare two vibrating strings, each has the same tension, but the second has four times the mass density of the first. The wave speed along the 2nd string is how many times the speed along the 1st?
A) 1/4 B) 1/2 C) 4 D) 2 E)
Physics & Space Science