The diagram represents energy levels in a hydrogen atom. The labeled transitions (A through E) represent an electron moving between energy levels
Suppose that an electron in a hydrogen atom absorbs 10.2 eV of energy, so that it moves from level 1 to level 2. What typically happens next?
A) The electron remains in level 2 until it absorbs an additional 10.2 eV of energy.
B) The electron jumps to level 3 as soon as it absorbs any additional energy.
C) A different electron drops into level 1, since it is now unoccupied.
D) The electron returns to level 1 by emitting an ultraviolet photon with 10.2 eV of energy.
D
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Gravity obeys an inverse square relation. This statement implies that the force due to gravity between two masses
a. will increase as the distance between the two masses increases. b. will decrease as the square of the distance between the two masses increases. c. will cause the two masses to move away from each other. d. will cause the two masses to move in a straight line. e. will cause the two masses to orbit each other.
Quasars are common in the early Universe because ____ at that time
a. galactic collisions were more frequent b. black hole collisions were more frequent c. gas and dust clouds were denser d. galaxies were more isolated e. central bulges were larger
Rotational Dynamics: A mechanic is examining the wheel of a bicycle to adjust the brake. With the bicycle off the ground, he manually rotates the wheel until it reaches an angular speed of 12.0 rad/s and then allows it to coast to a stop. If the wheel has a moment of inertia of 0.100 kg ? m2, and the wheel slows uniformly to a stop in 160 s, what is the magnitude of the retarding torque?
A. 1.00 N ? m B. 0.00750 N ? m C. 0.0787 N ? m D. 1.33 N ? m E. 1.67 N ? m
Which of the 4 fundamental forces binds the nucleus together, and which binds the atom [the electron orbits] together?
A) Strong nuclear force binds the nucleus, weak nuclear force binds the atom. B) Strong nuclear force binds the nucleus, electric force binds the atom. C) Weak nuclear force binds the nucleus, strong nuclear force binds the atom. D) Gravity binds the nucleus, electric force binds the atom. E) Electric force binds the nucleus, strong nuclear force binds the atom.