Which of the effects listed below is not a major effect influencing the binding energy of the nucleus in the liquid-drop model?
a. The volume effect: the binding energy per nucleon is approximately constant when A > 50.
b. The surface effect: nucleons in the surface have fewer neighbors.
c. The quantum number effect: all nucleons in the nucleus have the same set of quantum numbers.
d. The Coulomb repulsion effect: protons repel protons.
e. The symmetry effect: stable nuclei tend to have N ? Z.
c
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The Sun is located near a spiral arm
a. True b. False Indicate whether the statement is true or false
Which of the following measurements can be made only by recording and comparing the amount of light received from an astronomical source at many different times?
A) the rate at which a variable star brightens and dims B) the general shape of an interstellar cloud of gas C) the color of a planet D) the number of bright stars in a nearby star cluster
What happened to all of the quarks that existed freely during the particle era?
A) They froze out of the soup of particles at the end of the era. B) They combined in groups to make protons, neutrons, and their antiparticles. C) They evaporated. D) They combined in groups to make electrons and neutrinos.
If we photograph a person's face using dim light and an extremely short exposure time, the film will reveal
A) a spread out but very fuzzy image of the face. B) a very dim image of the face. C) only a few separated tiny spots that don't much resemble the face. D) only a few separated interference lines. E) only a single tiny spot right at the center.