Multiple Choice
What makes gravity the main force determining the large?-scale structure of the universe?
A) Gravity is the strongest of the four fundamental forces.
B) Gravity is the only force that has an infinite range.
C) While the electromagnetic force of a charged particle has an infinite range, it is usually screened (and limited) by the existence of charges of the opposite sign. Ordinary matter always exerts gravity that is attractive.
D) The gravitational force, while short-ranged, is the only force that affects all particles: photons, quarks, charged particles, uncharged particles.
Correct Answer:
Verified
Correct Answer:
Verified
Q201: In a primordial, pregalactic gas cloud, what
Q202: What significant event occurred about 400,000 years
Q203: What do cosmologists study?<br>A) formation, structure, and
Q204: How does the cosmological constant differ from
Q205: Helium nuclei began permanent formation in the
Q207: What kind of curvature (geometry of space)
Q208: If the cosmic microwave background radiation is
Q209: Approximately when did the inflationary period begin?<br>A)
Q210: What kind of curvature (geometry of space)
Q211: Why is flatness a problem in cosmology?<br>A)