If a helium-filled balloon is released on Earth, it rises. How would a helium-filled balloon move if it were released a few feet above the surface of the moon?
A) It would remain suspended at the point of release.
B) It would rise.
C) It would fall, but much more slowly than a rock dropped on the moon.
D) It would turn into a giant pumpkin.
E) It would fall at the same rate a rock falls when dropped on the moon.
E
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In the Bohr model of the hydrogen atom the non-radiating orbits are determined by quantizing the ________ (physical quantity).
What will be an ideal response?
The last step in cosmic evolution is:
A) particulate evolution. B) stellar evolution. C) chemical evolution. D) biological evolution. E) cultural evolution.
When electrons fill a subshell in which the orbitals have equal energy, the order in which the orbitals are filled is such that
a. a minimum number of electrons has unpaired spins. b. a minimum number of electrons has intrinsic angular momentum. c. a maximum number of electrons has unpaired spins. d. a maximum number of electrons first fills the next energy level. e. the maximum number of electrons has the same set of quantum numbers.
Luminous (normal) matter makes up approximately what percentage of the known matter in the universe?
A) 15% B) 5% C) 60% D) 95%