A spectral line produced in the atmosphere of a star may be seen as broad whereas interstellar _______________ lines are very narrow

a. absorption b. continuous
c. emission d. All of the other choices are correct.


a

Physics & Space Science

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Seyfert galaxies are ________.

A. isolated black holes emitting radio waves B. bright elliptical galaxies C. spiral galaxies whose nucleus is abnormally luminous D. small irregular galaxies E. None of these choices is correct.

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According to the Big Bang theory, atoms would have likely begun to form after approximately

A. 0.5 second. B. 10 billion years. C. 1 year. D. 400,000 years. E. 3 seconds.

Physics & Space Science

Electric current is measured in which SI units?

a) watts. b) joules. c) amperes. d) coulombs.

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The volume of water that flows past a given point in a channel during a specified time is called

A) load. B) gradient. C) discharge. D) runoff.

Physics & Space Science