The finding of an abnormally high concentration of the element named ______________ was the first clue to the probable cause of the K-T event
Fill in the blank(s) with correct word
iridium
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Which of the following statements best describes how the uncertainty principle affects conservation of energy?
A) The uncertainty principle allows very short time-scale violation of energy conservation, but energy must still be conserved on time scales that allow measurement. B) The uncertainty principle invalidated the law of conservation of energy, and as a result, this law is no longer useful to physicists. C) The uncertainty principle does not apply to energy, so conservation of energy is not affected by it. D) The uncertainty principle tells us that the law of conservation of energy applies only to very large objects, not to atoms or molecules.
From Earth, the view of the Milky Way is a thin band of stars across the night sky. The part of the Milky Way galaxy that is described here is the:
A) bulge. B) spiral arm. C) disk. D) halo. E) globular cluster.
In general, the spectral lines of molecules are
A) more complex than those of atoms. B) less complex than those of atoms. C) only absorption lines. D) the same as the atoms they contain. E) nonexistent.
A typical, neutrally charged atom has
A. as many electrons as protons and neutrons combined. B. just as many electrons as protons. C. no neutrons in the nucleus. D. at least 1 neutron. E. more protons than electrons.