Multiple Choice
Cosmology: The universe first became transparent to most light, coinciding with the origin of the cosmic background radiation, when the universe cooled enough to allow the formation of
A) protons and neutrons.
B) atomic nuclei.
C) neutral atoms.
D) stars and galaxies.
Correct Answer:
Verified
Correct Answer:
Verified
Q10: Stars: If a spherical galaxy of diameter
Q11: Particles: Hadrons are divided into two subgroups
Q12: Particle accelerators: A cyclotron of radius 0.25
Q13: Conservation laws: The decay n → p<sup>+</sup>
Q14: Hubble's law: A galaxy is observed receding
Q16: Particles: What type of particle is a
Q17: Quarks: Composite particles that are composed of
Q18: Particles: Particles that do not interact via
Q19: Cosmology: The cosmic background radiation corresponds to
Q20: Cosmology: Dark matter was initially proposed to