Two stars, Fred and Barney, are of the same size. Fred has spectral type F, while Barney has spectral type B. Which one is more luminous?
What will be an ideal response?
Barney has a hotter surface temperature than Fred. Since they have the same surface area, Barney is also more luminous.
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Power: If we double the resistance in a circuit but keep the current in it constant, the power dissipated by that circuit will
A. be four times as great. B. be two times as great. C. be one-half as great. D. be one-fourth as great.
Which of the following are signposts of the presence of high mass stars, and thus recent star formation?
A) closely spaced low mass stars B) predominantly blue reflection nebulae C) predominantly red ionization nebulae D) A and C E) B and C
When did life first appear on Earth?
a. 14 billion years ago b. 400 million years ago c. 4.6 billion years ago d. 65 million years ago e. 3.4 billion years ago
Which one of the following terms describes the resistance that a battery (or other emf device) has in a circuit?
a) super resistance b) critical resistance c) internal resistance d) terminal resistance e) electroresistance