The elements hydrogen and helium were made during the first few minutes after the big bang
a. True
b. False
Indicate whether the statement is true or false
True
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If we can solve the orbital motion of an eclipsing binary, we can find
a. the mass of each star. b. the diameter of each star. c. the distance to the binary. d. all of the other choices. e. the mass of each star and the diameter of each star.
Radioactive Decay: Americium-243 has a decay constant of 9.39 × 105 years-1. How long will it take for a sample of americium-243 to lose one-third of its nuclei?
A. 2960 s B. 10.6 × 103y C. 4.32 × 103 y D. 6.44 × 103 y E. 7.84 × 103 y
Which of the following best defines screencast?
A. A video podcast. B. The process of converting an analog video to digital. C. RWD technique to adjust video to fit the user's screen size. D. A video of a computer screen's changing content over time.
Chemically, clean [non-polluted] air is
A) an element. B) a mixture. C) a compound. D) an isotope.