Mesons are always composed of
a. two quarks, one being classified as a quark and the other as an antiquark.
b. a quark of one color and an antiquark of the anticolor.
c. an up or down quark and a down or up antiquark.
d. Two of the above choices are correct.
d
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Pressure in a Liquid: The deepest point of the Pacific Ocean is 11,033 m, in the Mariana Trench. What is the gauge pressure in the water at that point? The density of seawater is 1025 kg/m3.
A. 5.55 × 107 Pa B. 8.88 × 107 Pa C. 1.11 × 108 Pa D. 2.22 × 108 Pa E. 3.33 × 108 Pa
Which one of the following is TRUE?
A) Most elliptical galaxies contain only young stars. B) Most galaxies appear to be approaching the Milky Way Galaxy. C) Irregular galaxies rarely have star formation taking place in them. D) Smaller galaxies called dwarf galaxies tend to be found around larger galaxies like the Milky Way. E) Galaxy collisions destroy most of the stars in the galaxies involved.
Among the following electromagnetic waves, photons of which electromagnetic radiations carry the highest energy?
A) X-rays B) Visible light C) Radio waves D) Gamma rays
Atomic Nucleus: The primary reason that very large nuclei are unstable is due to
A. the cumulative repulsive force of the protons. B. the cumulative attractive force between the protons and the orbiting electrons. C. the repulsive force between the neutrons and the protons. D. the extreme weakness of the gravitational attraction of the protons.