Where are open clusters found?
A.) No stars are forming in the galaxy today.
B.) In the halo
C.) In the disk.
D.) Only around the Sun.
E.) B and C.
Answer: C.) In the disk.
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Which of the following statements about electron degeneracy pressure and neutron degeneracy pressure is true?
A) Electron degeneracy pressure is the main source of pressure in white dwarfs, while neutron degeneracy pressure is the main source of pressure in neutron stars. B) Both electron degeneracy pressure and neutron degeneracy pressure help govern the internal structure of a main-sequence star. C) The life of a white dwarf is an ongoing battle between electron degeneracy pressure and neutron degeneracy pressure. D) In a black hole, the pressure coming from neutron degeneracy pressure is slightly greater than that coming from electron degeneracy pressure.
The surface tension of water is 0.073 N/m. How high will water rise in a capillary tube of diameter 1.2 mm?
A) 1.2 cm B) 1.5 cm C) 2.2 cm D) 2.5 cm E) 2.8 cm
Carbon-14 Dating: Modern in-air nuclear bomb tests have created an extra high level of 14C in our atmosphere. If future archaeologists date samples from this era, without knowing of this testing, will their carbon-14 dates be too young, too old, or correct? If correct, why?
A. Too young. B. Too old. C. Correct, since 14C from bomb tests is different from that produced naturally. D. Correct, because modern biological materials do not gather 14C from bomb tests.
The nucleus that has the least mass per nucleon is
A) hydrogen. B) iron. C) lead. D) uranium. E) plutonium.