Laboratory experiments conducted with particle accelerators confirm predictions made by the theory that unifies
A) the electromagnetic and weak forces into the electroweak force.
B) the strong, weak, and electromagnetic forces into the GUT force.
C) the unification of all four forces into a single "superforce."
D) the strong and weak forces into the combined nuclear force.
A
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Suppose an elliptical galaxy is so far away that we cannot see even its brightest stars individually. Which of the following techniques might allow us to measure its distance?
A) We could use parallax. B) We could use Cepheid variables as standard candles. C) We could use a white dwarf supernova as a standard candle. D) We could use radar ranging.
If extra dimensions do exist, why wouldn't we see obvious evidence for them in everyday life?
a) because they affect only the strength of the strong force andnot of any other forces b) They are the same as the dimensions that we do perceive. c) They will only be present in the distant future. d) They were only present at the time of inflation and before. e) They would be quite small and hard to detect.
Where do stars form and why?
A) Stars form around giant planets because planets provide the "seeds" of star formation. B) Stars form in cold gas clouds because gravity has to be stronger than gas pressure. C) Stars form in warm dust clouds because the dust shields the protostars from radiation. D) Stars form in hot gas clouds because stars have to be hot to start fusion reactions.
What is the de Broglie wavelength of an electron whose kinetic energy is 1.0 eV?
A) 520 nm B) 8.2 nm C) 0.64 nm D) 52 nm E) 1.2 nm