The quantity of work equal to one joule is also equivalent to which of the following?
a. watt
c. watt × s
b. watt /s
d. watt /s2
C
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Two electrons are placed into separate (very tiny) one-dimensional boxes A and B. When the electrons are excited to higher energy levels and then decay to lower levels, they emit photons. The longest-wavelength spectral line from the electron in box A is observed to have the same wavelength as the third-longest spectral line from the electron in box B. The ratio of the box lengths LA/LB is equal to
A. 3/7
B. 7/3
C. 
D. 
E. 9/49
Both the microscope and the telescope make the object appear much larger. Why are these two instruments designed differently (e.g., why are the equations for magnification quite different)?
What will be an ideal response?
When the intensity of the light is increased in a photoelectric effect experiment, the energy of the emitted electrons
a. increases b. decreases c. stays the same d. becomes more quantized e. becomes less quantized
What helps explain the fact that neutrons rather than protons make the nucleus of a heavier element more stable?
a. The gravitational force of the neutrons attracts all other nucleons, but a proton can also repel other nucleons with the same charge. b. The weak force in the nucleus of a heavy element is balanced by the presence of more neutrons. c. The strong force for between a neutron and another nucleon is much stronger than between a proton and a proton. d. The strong force exerted by both neutrons and protons acts between neighboring nucleons, while the electrostatic repulsion between protons has longer range. e. The strong force increases as the element gets heavier, which makes it harder for protons to join the nucleus.