Two isotopes have the same
a. mass number.
b. neutron number.
c. atomic number.
d. quantum number.
e. none of the above
c
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Which of the following statements is true of the evolution of massive stars?
A) Once the gas in the core of a massive star has been converted to iron, there are no further nuclear reactions that can release energy. B) Once helium fusion has occurred, the core of the massive star will never get hot enough to fuse any additional elements. C) Silicon fusion produces neon, the most tightly bound of all atomic nuclei, which inhibits the release of energy after a nuclear fusion. D) The most massive blue giant stars can fuse elements heavier than iron in their cores.
A jet has an angular length of 10 seconds of arc and flows from a star at a distance of 2,000 pc. How far does this jet extend away from the star?
a. 20,000 pc b. 20,000 AU c. 20, 000 ly d. 20,000 miles e. 20,000 km
An organ pipe is open at one end and closed at the other. The frequency of the third mode is 300 Hz higher than the frequency of the second mode. If the speed of sound is 345 m/s, then what is the length of the organ pipe?
A. 50.3 cm B. 57.5 cm C. 64.5 cm D. 66.7 cm E. 70.5 cm
Why is there a limit to how much compression can be counterbalanced by electron degeneracy pressure?
A) At extreme compression, the electron speeds approach the speed of light and therefore cannot increase further. B) At extreme compression, electrons are forced to stop moving, and once stopped there is nothing more they can do. C) At extreme compression, atoms are fully ionized, so electrons go free and can no longer exert pressure. D) The exclusion principle excludes electrons from exerting more pressure than the uncertainty principle would otherwise allow. E) Electrons are very small and are simply incapable of exerting much pressure.