For each 4He produced in a proton-proton chain, _____.
A) the first reaction must occur four times.
B) the first and second reactions must occur twice.
C) the second and third reactions must occur four times.
D) the third reaction must occur twice.
Question 2
Which of the following statements is true regarding shock waves?
A) They are predominantly transverse in nature.
B) They can be produced by the birth of very hot stars.
C) They are also called shear waves.
D) They cannot be produced by supernova explosions.
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