The transitions of an electron in the hydrogen atom to the n = 3 level result in the
a. Lyman series.
b. Balmer series.
c. Paschen series.
d. Bohr series.
c
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Galaxy seeds around which galaxies, clusters, and walls grey may have been
a. caused by hot dark matter. b. caused by baryons. c. the result of the separation of the electromagnetic and weak forces. d. the result of freezing water molecules shortly after the universe became transparent to photons. e. caused by defects in space-time.
In a cyanine dye molecule, one electron is free to move up and down along a linear chain of carbon atoms, but cannot pass the nitrogen atoms at each of the chain’s ends. Assume that the length of the chain does not change much as we increase the electron’s energy (within reasonable limits). Which of the idealized models in this chapter might best describe the electron in this situation?
A. The quanton in a box model B. The Bohr model C. The simple harmonic oscillator model
The most basic difference between elliptical galaxies and spiral galaxies is that
A) elliptical galaxies lack anything resembling the disk of a spiral galaxy. B) elliptical galaxies lack anything resembling the halo of a spiral galaxy. C) spiral galaxies lack anything resembling the distribution of stars in an elliptical galaxy. D) elliptical galaxies are old and spiral galaxies are young.
In the formula E=mc2, what does E represent?
A) the mass-energy, or potential energy stored in an object's mass B) the kinetic energy of a moving object C) the radiative energy carried by light D) the gravitational potential energy of an object held above the ground