An experiment determines that there are 49 allowed rotational energies for a diatomic molecule whose moment of inertia is 2 × 10^?46 kg ? m2 . The maximum rotational kinetic energy (in eV) is
a. 0.6
b. 0.2
c. 0.4
d. 0.8
e. 1.0
c
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Astronomers have found the cosmic microwave background (CMB) radiation. What is the nature of this radiation?
A. It is a faint, uniform X-ray glow. B. It is a weak and very patchy glow at visible wavelengths. C. It is a faint, uniform radio signal. D. It is a bright, uniform X-ray glow. E. It is a weak background of cosmic neutrinos.
According to current models of solar system formation, why did Uranus and Neptune end up to be much less massive than Jupiter and Saturn?
A) Particles in the solar nebula were more spread out at greater distances, so that accretion took longer and there was less time to pull in gas before the solar wind cleared the nebula. B) Ices were able to condense at the distance of Jupiter and Saturn, but only rock and metal could condense at the distances of Uranus and Neptune. C) The solar nebula had different chemical composition at different distances from the Sun, leading to the differences in mass. D) The size differences are thought to be a random coincidence.
We are able to define a mechanical equivalent for heat because
a. some thermal energy can be converted into mechanical energy. b. mechanical energy can be converted into thermal energy. c. work can be converted into thermal energy. d. some thermal energy can be converted into work. e. all of the above can occur.
The threshold wavelength for photoelectric emission of a particular substance is 500 nm. What is the work function (in eV)?
a. 4.2 b. 4.0 × 10^-19 c. 4.0 × 10^-10 d. 2.5 × 10^-19 e. 2.5