What happens because of the formation of atoms?
A.) Nucleosynthesis.
B.) Formation of protons.
C.) Formation of quarks.
D.) The cosmic microwave background is produced.
E.) The Universe starts to contract.
Ans: D.) The cosmic microwave background is produced.
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Photon Energy: A photon of blue light and a photon of red light are traveling in vacuum. The photon of blue light
A. has a smaller wavelength than a photon of red light and travels with the same speed. B. has a smaller wavelength than a photon of red light and travels with a greater speed. C. has a longer wavelength than a photon of red light and travels with the same speed. D. has a longer wavelength than a photon of red light and travels with a greater speed.
Consider a wire bent in the hairpin shape shown below. The wire carries a conventional current I as shown. What is the magnitude 
of the magnetic field
at point a? A. ?0 I/4?R B. ?0 I/2?R C. ?0 I/?R D. ?0 I/R E. (2 + ?)?0 I/4?R F. Zero
According to the supermassive black hole hypothesis, how is the energy that powers active galactic nuclei produced?
A) by nuclear fusion near the central black hole B) by magnetic fields that trap and accelerate charged particles C) by the impact of jets being shot out of the central black hole D) by converting the gravitational potential energy of infalling matter to kinetic energy and thermal energy E) by matter—antimatter annihilation
The mass of an electron and its antiparticle, a positron, is 0.511 MeV/c2 . In order to produce an electron-positron pair, a gamma ray must have an energy larger than 1.022 MeV because __________
Fill in the blank(s) with correct word