The electron was discovered by ________ (one name) in his study of ________ (two words).
What will be an ideal response?
Thomson, cathode rays
Thompson, cathode rays
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In the late 1990's, it was announced that the expansion of the Universe is accelerating. What does this imply from the perspective of the big bang?
a. A force exists that we knew nothing about that causes the acceleration. b. The Universe must be closed. c. The Universe is finite. d. The amount of dark matter must be greatly less than the amount of normal matter. e. The Universe must be infinitely old.
The speed of light changes when it goes from ethyl alcohol (n = 1.36) to carbon tetrachloride (n = 1.46). The ratio of the speed in carbon tetrachloride to the speed in ethyl alcohol, v2/v1, is
A. 1.99. B. 1.07. C. 0.932. D. 0.511. E. 0.760.
Saturn's two shepherd moons herd the particles in the F ring
Indicate whether the statement is true or false
The Carboniferous Period began about
A) 475 million years ago B) 65 million years ago C) 360 million years ago D) 542 million years ago