Once a theory has been tested thoroughly and is confidently believed by scientists, it becomes a ____________________
Fill in the blank(s) with correct word
natural law
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The distance from a wave's crest to its undisturbed state is the ________
Fill in the blank(s) with correct word
(From a science quiz that appeared in the weekly magazine The Economist.) Economic history is easier to write than the history of the universe
Nevertheless, most cosmologists now think that when the universe was formed in which of the following manners? A) First there was a Big Bang, then inflation (of space) caused recession (of all matter, away from the Big Bang). B) First there was inflation, which caused the Big Bang, then recession. C) First there was a Big Bang. There has not been any inflation yet, but if it comes it will cause recession.
The astronomer who mapped the orbits of stars near the Milky Way Galaxy's supermassive black hole was _____
A. Andrea Ghez
B. Harlow Shapley
C. Walter Baade
D. Caroline Herschel
Ellen places an object 48.4 cm from a concave lens. If a virtual image appears 24.6 cm from the lens on the same side as the object, what is the focal length of the lens?
a. –16.3 cm b. –50.0 cm c. 732 cm d. –23.8 cm e. –36.5 cm