Which of the following statements is true of Jupiter's interior?
A) High pressure creates a sudden boundary between liquid and gas.
B) It is four times colder than the Sun's surface.
C) The rocky core at Jupiter's center contains light-weight elements.
D) It is composed of a material that is a very good conductor of electricity.
D
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An atom of helium can store energy by bumping an electron from its lowest orbital energy state to a higher orbital energy level. In particular, moving an electron from the lowest state to the next-lowest state would store an energy of 24.6 eV. Why can we ignore this energy storage mode when calculating the heat capacity of helium gas?
A. This mode is “frozen” out at normal temperatures. B. Collisions between atoms can’t influence the energy levels of electrons inside the atoms. C. This storage mode is completely independent of the kinetic and/or rotational energy modes. D. Only modes involving helium molecules count. E. We have ignored this mode only for simplicity’s sake. F. Some other reason (specify).
we imagine the history of the universe compressed into one year, with the present as the stroke of midnight at the very end of that year, dinosaurs became extinct
A) about 6 months ago. B) about 3 weeks ago. C) yesterday morning. D) about an hour ago.
which of the following stars lives the longest life?
What will be an ideal response?
An electron is moving at 
m/s perpendicular to a uniform magnetic field. If the radius of the motion is 18 mm, what is the magnitude of the magnetic field?
A. 70 mT
B. 0.95 mT
C. 9.3 mT
D. 1.6 
T
E. 8.9 nT