Which of the following gases, which we can detect (if present) in infrared spectra, would be a strong indicator of life on another planet?
A) water vapor
B) sulfuric acid
C) carbon dioxide
D) methane
E) ozone
E
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If the AA designation of an alloy has three digits, it is a(n) _________alloy.
Fill in the blank(s) with the appropriate word(s).
We can determine the surface temperature of a star from
a. studying its continuous spectrum. b. studying its line absorption spectrum. c. measuring the star's luminosity. d. studying its continuous spectrum and measuring the star's luminosity. e. studying its continuous spectrum, studying its line absorption spectrum, and measuring the star's luminosity.
A diatomic molecule is vibrating in its first excited quantum state above the ground state
In that excited state, its frequency is 2.0 × 1013 Hz. What is the energy of the molecule in this state? (h = 6.626 × 10-34 J • s, h = 1.055 × 10-34 J • s, 1 eV = 1.60 × 10-19 J A) 0.041 eV B) 0.083 eV C) 0.15 eV D) 0.12 eV E) 0.17 eV
What is a gluon?
a. A flavor of quark. b. The most newly discovered lepton. c. A combination of three complementary quarks. d. A particle exchanged by quarks. e. A particle exchanged by electrons to give electrical repulsion.