Fundamental to semiconductors are
A. bound electrons.
B. free electrons.
C. both of these in various proportions
D. none of the above
Answer: C
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Otto Hahn and Fritz Strassmann discovered fission by bombarding uranium with neutrons. Their discovery was made possible by finding one of the fission products, barium (Ba, atomic no. = 56). What is a reasonable explanation for why they were unable to initially observe the other product, krypton (Kr, atomic no. = 36)?
A. The isotope of krypton generated might have a short half-life and had undergone radioactive decay to some other element. B. Krypton is a noble gas and therefore chemically unreactive, making it difficult to characterize by chemical means. C. Krypton is a noble gas and it may have diffused out of the sample. D. both A and B E. all of the above
Pangaea is ____________.
a) another name given the Alaskan earthquake of 1964 b) a portion of the mid-Atlantic ridge c) a German word for "plate tectonics" d) the name of a supercontinent meaning "All Land" e) all of the above
How is rock age described?
What will be an ideal response?
Which of the following is the most convincing piece of evidence set forth to support the concept of sea floor spreading?
A) The correlation of rocks found in adjacent positions on matching continents. B) The mid-ocean ridge is entirely volcanic in origin. C) The mid-ocean ridge rises more than 2.5 kilometers above the surrounding deep-ocean floor. D) The oceanic pattern of alternating reversals of Earth's magnetic field.