If observations had shown that the cosmic microwave background was perfectly smooth (rather than having slight variations in temperature), then we would have no way to account for
A) the relationship between the strong and the weak force.
B) the fact that our universe is expanding.
C) how galaxies came to exist.
D) the existence of helium in the universe.
C) how galaxies came to exist.
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Suppose unlike Chelyabinsk, the next major asteroid impact we experience is more devastating. Why might this be?
A) The asteroid is larger in size. B) It has a more vertical trajectory, and is therefore less likely to break up in the atmosphere due to friction. C) It hit water, which will cause a world-wide tsunami. D) Both A and B
A key feature of the theory of chaos is
A) unpredictability. B) very small initial differences can lead to very large eventual differences. C) the randomness of molecular motion makes prediction difficult. D) even orderly systems are seen to be disorderly when carefully studied.
In the hydrogen atom the potential energy is negative, but the absolute value of the potential energy
a. is equal to the kinetic energy of the electron. b. is twice the kinetic energy of the electron. c. is half the kinetic energy of the electron. d. is equal to n2 times the kinetic energy of the electron.
Which of the following is not one of the major types of metamorphism?
a. Contact b. Fold c. Shear d. Regional