The Northern and Southern hemispheres have equal illumination from the Sun
A) on the June and December solstices.
B) on the March and September equinoxes.
C) on all four of the equinoxes and solstices.
D) only on the March equinox.
E) at all times.
B) on the March and September equinoxes.
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Suppose Bohr had chosen the potential energy of the electron in the hydrogen atom to be V = 0 when the electron is in the orbit with n = 1 . He could do this by
a. choosing n = 1 for the orbit where the kinetic energy of the electron is zero. b. adding a constant 13.6 eV to the potential energy for all values of n. c. adding a constant 27.2 eV to the potential energy for all values of n. d. subtracting a constant 13.6 eV from the potential energy for all values of n. e. subtracting a constant 27.2 eV from the potential energy for all values of n.
Is it possible to have a macroscopic sample of oxygen that has a mass of 14 atomic mass units?
A) Yes, but it would need to be made of oxygen atoms that each had less than the normal number of neutrons. B) No, this is less than than the mass of a single oxygen atom. C) Yes, but it would have the same density as nitrogen. D) No, because oxygen is a gas at room temperature.
Which terrestrial world has the strongest magnetic field?
A) Mars B) Earth C) the Moon D) Venus E) Mercury
A satellite circles planet Roton every 2.8 h in an orbit having a radius of 1.2 × 10^7 m. If the radius of Roton is 5.0 × 10^6 m, what is the magnitude of the free-fall acceleration on the surface of Roton?
a. 31 m/s2 b. 27 m/s2 c. 34 m/s2 d. 40 m/s2 e. 19 m/s2