In the particle model, light is ________.
A. a mix of electric and magnetic energy
B. the absence of dark
C. a packet of energy moving through space
D. a compression wave moving through the air
E. a ripple in space-time
Answer: C
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What is the most likely outcome after the collision between two spiral galaxies?
A. the destruction of most of their stars B. formation of a larger galaxy C. enhanced formation of spiral arms D. All of these choices are correct.
A typical white dwarf is
A) as massive as the Sun but only about as large in size as Earth. B) as large in diameter as the Sun but only about as massive as Earth. C) about the same size and mass as the Sun but much hotter. D) as massive as the Sun but only about as large in size as Jupiter.
Bar One has a Young's modulus that is bigger than that of Bar Two. This indicates Bar One
a. is longer than Bar Two. b. has a greater cross-sectional area than Bar Two. c. has a greater elastic limit than Bar Two. d. is made of material that is different from Bar Two.
A nuclear reactor is said to be critical when the average number of neutrons from each fission event that cause(s) another fission event is
a. <1. b. 1. c. >1. d. any of the above. e. only (b) or (c) above.