We usually find dark molecular clouds beside bright emission nebulae
Indicate whether the statement is true or false
TRUE
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Refer to the figure above showing the abundance of elements in the galaxy relative to hydrogen. What is the least abundant element with an atomic number less than iron's?
A) hydrogen B) lithium C) beryllium D) nitrogen
What happens after a helium flash?
A) The core quickly heats up and expands. B) The star breaks apart in a violent explosion. C) The core suddenly contracts. D) The core stops fusing helium. E) The star starts to fuse helium in a shell outside the core.
The first spacecraft to return surface samples of an asteroid was named
A) Dawn. B) Stardust. C) Giotto. D) Hayabusa. E) NEAR.
The energy level diagram for hydrogen
The energy of the most energetically possible photon emitted is
a.
1.5 eV.
b.
1.9 eV.
c.
3.4 eV.
d.
10.2 eV.
e.
13.6 eV.