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
You might also like to view...
The angular resolution of an 8 inch diameter telescope is ________ times greater than that of a 2 inch diameter telescope
A) 8 B) 2 C) 16 D) 4 E) 9
Stalactites are
a. Rocks solidified from molten material below ground. b. Consolidated sediment deposited in layers. c. Dripstone formations that form on cavern floors. d. Dripstone formations that form on cavern ceilings.
A 2.0-m rope is lying on a table. You pick up one end and start raising it vertically. How high above the table is the center of mass (or center of gravity) of the rope when half of the rope has lifted off the table?
A) 0.25 m B) 0.50 m C) 0.75 m D) 1.0 m E) 1.5 m
Light is refracted through a diamond. If the angle of incidence is 30°, and the angle of refraction is 12°, what is the index of refraction?
a. 1.3 b. 2.4 c. 2.6 d. 1.8 e. 0.4