Should we expect to find abundant amounts of gold and other rare-earth elements elsewhere in the universe?
What will be an ideal response?
Gold, platinum, and other rare-earth elements are produced during the highly energetic, cataclysmic mergers of neutron stars. Because binary systems of neutron stars are rare, we do not expect an abundance of these elements.
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Does a planetary nebula have anything to do with planets? Explain
What will be an ideal response?
The following conversion equivalents are given: 1.0 mile = 5280 ft 1.0 ft = 12 in 1 m = 39.37 in 1.0 hour = 60 min 1.0 min = 60 s If a deer runs at 4.7 mi/h, its speed, in meters per second, is closest to
A) 2.1 m/s. B) 1.7 m/s. C) 1.9 m/s. D) 2.3 m/s. E) 2.5 m/s.
The energy of the ground state in the Bohr model of the hydrogen atom is -13.6 eV. The energy of the n = 2 state of hydrogen in this model is closest to
A) -4.5 eV. B) -6.8 eV. C) -1.7 eV. D) -13.6 eV. E) -3.4 eV.
For the ion He+, what is the energy of the ground state?
A. -13.6 eV B. -27.2 eV C. -54.4 eV D. -6.80 eV E. -3.40 eV