Which of the following statements is true of the third reaction in the proton-proton chain?
A) It yields a helium atom.
B) It emits a neutrino.
C) It emits a gamma ray.
D) It yields carbon dioxide.
Question 2For 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 3Which 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.
Question 4The strong nuclear force is involved in:
A) binding together atomic nuclei.
B) developing the majority of nuclear energy.
C) the radioactive decay of certain kinds of nuclear particles.
D) the attraction of atomic nuclei over macroscopic distances.
Question 5__________is microscopic solid grains in the interstellar medium.
A) Main-sequence dust
B) Interstellar dust
C) Interstellar mud
D) Main-sequence mud
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