Contrast the original and present uses of the Cosmological Constant
What will be an ideal response?
Originally Einstein added it to General Relativity to stabilize a presumably static universe against either contraction or expansion, for astronomers then thought the universe static. Today we apply the cosmological constant to the wild card of dark energy to explain the acceleration of the expansion, overpowering gravity.
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Radio maps of the spiral arms of our galaxy
a. reveal that our galaxy is a grand design spiral. b. map the location of hot O and B stars by the radio radiation they emit. c. reveal that the spiral arms are winding up and growing closer together. d. reveal that the Sun is currently located in the center of a spiral arm. e. map the location of dense neutral hydrogen clouds.
On what four assumptions is the principle of faunal succession based?
What will be an ideal response?
The mass number is equal to the number of what particles in the nucleus?
A) protons B) neutrons C) nucleons D) electrons E) positrons.
Which is not a possible value for the principal quantum number n?
a. 3 b. 7 c. 3/2 d. None of these