When the nuclear reactions begin making too much energy in a star, by virtue of the natural thermostat, the star:
A) would expand slightly.
B) would increase its central temperature.
C) would increase its density.
D) would reduce the mass by a factor of 0.5.
A
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Hydrogen lines are weak in the spectra of hot stars because many of the hydrogen atoms have their electrons in levels above the second level
a. True b. False Indicate whether the statement is true or false
What makes the North Star, Polaris special?
a) it appears very near the north celestial pole b)it is the brightest star in the sky c) it can be used to determine your longitude on Earth d) it is the star directly on your northern horizon
The electrical force on a 2-C charge is 60 N. The electric field where the charge is located is
A) 20 N/C. B) 30 N/C. C) 60 N/C. D) 120 N/C. E) 240 N/C.
The Jovian planets have low density because:
A) they formed in the outer solar nebula where water vapor could freeze to form ice particles. B) interactions between their magnetic fields and the solar wind generate powerful electric currents. C) the continuous blast of micrometeorites evaporates surface ice, leaving behind embedded minerals. D) the heat flowing out of them emits about twice as much less energy as they absorb from the Sun.