Pulsars are thought to be
A) accreting white dwarfs.
B) rapidly rotating neutron stars.
C) unstable high-mass stars.
D) accreting black holes.
B) rapidly rotating neutron stars.
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The interface between epoxy and glass fibers in fiberglass is a(n) _____________boundary.
Fill in the blank(s) with the appropriate word(s).
When waves from a pair of closely-spaced slits arrive out of phase
A) a bright fringe is produced. B) a dark fringe is produced. C) both bright and dark fringes are produced. D) none of the above
The two concepts that led Niels Bohr to refine the planetary model of the atom are
A. discovery of the nucleus and quantization of energy. B. properties of electrons and the hydrogen spectrum. C. discovery of the nucleus and properties of electrons.
The carbon dioxide cycle is important to Earth because it
A) helps sustain the planet's plant base. B) has been recognized by the Nobel Prize award committee. C) and the oceans are critical in moderating and regulating the Earth's temperatures. D) prevents the gradual buildup of oxygen, which would eventually lead to a combustible atmosphere.