In this diagram, red balls represent protons and gray balls represent neutrons. What reaction is being shown?
A) fusion of helium into carbon
B) fusion of hydrogen into helium
C) fusion of carbon into oxygen
D) the "iron catastrophe" that initiates a supernova
A) fusion of helium into carbon
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Graphical Addition: If 
- 
= 0, then the vectors 
and 
have equal magnitudes and are directed in the same direction.
A. True B. False
________ is the thermonuclear fusion of hydrogen to form helium operating in the cores of massive stars on the main sequence
a. The CNO cycle b. The proton-proton chain c. Hydrostatic equilibrium d. The neutrino process e. None of the above
How is light different from sound?
A. Sound requires a medium to move through; light does not. B. Light can be treated as a wave; sound cannot. C. Sound of any frequency can be heard; only visible light can be seen. D. Light can be reflected from a surface; sound cannot.
The type of reproduction that occurs between human beings is referred to as
A) unsexual B) carnal C) asexual D) sexual