In folded terrain, a simple symmetrical downfold is termed a(n) ________.
a - overthrust fold
b - monocline
c - anticline
d - syncline
e - magma pool
d - syncline
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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) Krypton is a noble gas and it may have diffused out of the sample. B) The isotope of krypton generated might have a short half-life and had undergone radioactive decay to some other element. C) Krypton is a noble gas and therefore chemically unreactive, making it difficult to characterize by chemical means. D) both A and B E) all of the above
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Suppose that a certain atom possesses only four distinct energy levels. Assuming that all transitions between levels are possible, how many spectral lines will this atom exhibit?
A. unlimited B. six C. three D. four