What is necessary for differentiation to occur in a planet?
a. It must be made of metal and rock.
b. It must be made of a mix of materials of different density.
c. Material inside must be able to flow.
d. All of the above.
e. b and c.
Ans: e. b and c
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Louis de Broglie
A) set the limits on the probability of measurement accuracy (1927). B) suggested the existence of matter waves (1924). C) predicted the positron from relativistic quantum mechanics (1928). D) developed a wave equation for matter waves (1926). E) was the first to produce X-ray-like diffraction patterns of electrons passing through thin metal foil (1927).
What are Type I supernovae used for?
A) standard candles for determining distances to other galaxies B) age-dating the massive stars in clusters where they blow up C) explaining the pulsars in supernova remnants D) calculating the density of the interstellar medium from their remnants E) determining the half-lives of the heavy elements they create
In general, elements that have four to eight electrons in their valence shell are
a. semimetals. b. metalloids. c. nonmetals. d. metals.
Two identical objects are released from rest from heights R and 2R above the surface of the Earth. After traveling a distance R/2, which object has the larger energy?