Relate the temperature of the Big Bang to pair production in the quark and lepton epochs
What will be an ideal response?
The higher the temperature, the greater the energy of the colliding photons, and the heavier the particle-antiparticle pairs created; hence heavier protons and neutrons formed in the quark epoch before the lighter electrons in the lepton epoch.
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The easiest way to remember which quarks make up a neutron is
A. Neutrons are all about u-three up quarks: uuu. B. The neutron is a real "dud"-a down quark, an up quark, and another down quark: dud. C. A neutron is an inside-out proton: uud. D. Roses are red, violets are blue, neutrons are nosy but do not have u: ddd.
Which of the following elements are in the same group as silicon (Si)?
A) C B) P C) As D) B E) none of the above
A hollow sphere of negligible mass and radius R is completely filled with a liquid so that its density is ?. You now enlarge the sphere so its radius is 2R and completely fill it with the same liquid. What is the density of the enlarged sphere?
A) 8 ? B) 4 ? C) ?/2 D) ? E) ?/8
What distance methods is used to calibrate the Hubble constant?
a. Parallax b. Supernova observations c. variable stars d. both a and b e. both b and c