In a transition from one vibrational state to another, a molecule emits a photon of wavelength 5.56 µm. What is the energy difference between these two states? (c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s, 1 eV = 1.60 × 10-19 J)
A) 0.223 eV
B) 2.23 MeV
C) 13.6 eV
D) 13.6 MeV
E) 0.223 MeV
A
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______ navigation provides an overview of the website, and generally remains consistent from page to page.
A. Primary B. Subsidiary C. Contextual D. Adaptive
Radiation pressure: A radiometer has two square vanes (1.0 cm by 1.0 cm), attached to a light horizontal cross arm, and pivoted about a vertical axis through the center, as shown in the figure. The center of each vane is 6.0 cm from the axis. One vane is silvered and it reflects all radiant energy incident upon it. The other vane is blackened and it absorbs all incident radiant energy. Radiant energy, having an intensity of 300 W/m2, is incident normally upon the vanes. What is the radiation pressure on the blackened vane? (c = 3.0 × 108 m/s, ?0 = 4? × 10-7 T ? m/A, ?0 = 8.85 × 10-12 C2/N ? m2) 
A. 1.0 × 10-10 Pa B. 1.0 × 10-9 Pa C. 1.0 × 10-8 Pa D. 1.0 × 10-7 Pa E. 1.0 × 10-6 Pa
What eventually halts the gravitational collapse of an interstellar gas cloud that forms an object that is massive enough to become a star?
A) the central object becoming hot enough to sustain nuclear fusion in its core B) a critical fraction of the gas has been driven further into space C) nothing; all collapsing gas clouds become black holes D) the crowding of electrons in the core
What does the equivalent of an H-R diagram for galaxies, plotting luminosity versus color, show?
A) galaxies fill the diagram showing that there is no correlation between luminosity and color B) two clumps, one blue with relatively low luminosity, one red with relatively high luminosity, and a valley in between with few galaxies C) a continuum from faint, blue galaxies to bright, red galaxies D) a continuum from faint, red galaxies to bright, blue galaxies E) a main sequence, just as for stars