If life exists on Mars today it will most likely be found
A) everywhere—on the surface, beneath the surface, and in its atmosphere
B) on the surface
C) beneath the surface
D) in its atmosphere
C
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A certain substance has a half-life of 5.0 hours. How many nuclei of the substance are required to give an initial activity of 6.0 ?Ci? 1 Ci = 3.7 × Bq
A) 5.8 × 109 B) 8.5 × 108 C) 6.3 × 108 D) 3.2 × 109 E) 2.4 × 109
Naturally occurring uranium is mostly
A) 14U. B) 238U. C) 233U. D) 235U. E) good to eat.
When at rest, a spacecraft has the same height as length. When moving at relativistic speeds in the direction of its length, which one of the following describes its length and height to an observer at rest?
a. Its length is decreased and its height is increased. b. Its length is decreased and its height is decreased. c. Its length is decreased and its height is unchanged. d. Its length is unchanged and its height is increased. e. Its length is increased and its height is decreased.
Which of the following is not a point defect?
(a) Dislocation (b) Interstitial (c) Vacancy (d) Frenkel