Carbon fusion occurs in high-mass stars but not in low-mass stars because
A) the cores of low-mass stars never get hot enough for carbon fusion.
B) the cores of low-mass stars never contain significant amounts of carbon.
C) only high-mass stars do fusion by the CNO cycle.
D) carbon fusion can occur only in the stars known as carbon stars.
A) the cores of low-mass stars never get hot enough for carbon fusion.
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In contrasting the distribution of the X-ray and gamma-ray bursts, we find:
A) gamma ray bursts are far closer to us, so they appear more luminous. B) gamma ray bursts are far beyond our Galaxy, at cosmological distances, and spread all over the sky, not in the plane of our Galaxy. C) gamma ray bursts are more closely associated with open than globular clusters. D) gamma ray bursts can repeat, while the X-ray bursts do not. E) gamma ray bursts can be observed from the ground, but X-rays are blocked by the ionosphere for ground based observers.
Which of the following represents a departure from the philosophical materialism of Newtonian physics?
A) forces B) thermal energy C) the second law of thermodynamics D) sound waves E) electromagnetic fields
If a Cu2+ ion that is initially at rest accelerates through a potential difference of 12 V without friction, how much kinetic energy will it gain? (e = 1.60 × 10-19 C)
A) 3.0 eV. B) 6.0 eV. C) 12 eV. D) 24 eV.
Two tuning forks with frequencies 264 and 262 Hz produce "beats". What is the beat frequency (in Hz)?
a. 4 b. 2 c. 1 d. 3 e. 0 (no beats are produced)