Both protons and neutrons (and their anti-particles) froze out:
A) after 10-43 seconds, at the Planck Era.
B) at 1032 K, at the end of the Inflationary Era.
C) at 1013 K, about .0001 seconds after the Big Bang.
D) after about a minute of expansion.
E) about 50,000 years after the Big Bang.
C
You might also like to view...
Interactions among galaxies also are thought to influence a galaxy's type in at least some cases. Which of the following does not support the idea that interactions can shape galaxies?
A) the fact that more distant galaxies have larger redshifts B) computer modeling of collisions between galaxies C) the fact that galaxies with distorted appearances are more common at great distances than nearby D) the presence of features such as "tails" extending out of galaxies, bridges between galaxies, and rings of stars around galaxies
A 0.17 kg baseball is thrown with a speed of 38.m/s and it is hit straight back to the pitcher with a speed of 62.m/s. What is the magnitude of the IMPULSE exerted upon the ball by the bat?
What will be an ideal response?
Absorption lines are produced by ____
a. atoms that become ionized b. electrons that transfer from a high energy level to a low energy level c. electrons that transfer from a low energy level to a high energy level d. the intensity of agitation of atoms in a hot gas e. the motion of an object toward or away from the observer
A baseball pitcher loosens up his pitching arm. He tosses a 0.20-kg ball using only the rotation of his forearm, 0.32 m in length, to accelerate the ball. What is the moment of inertia of the ball alone as it moves in a circular arc with a radius of 0.32 m?
a. 1.5 × 10^-2 kg•m2 c. 4.0 × 10^-2 kg•m2 b. 2.0 × 10^-2 kg•m2 d. 7.6 × 10^-2 kg•m2