The two most abundant elements that make up the salinity of seawater are
A) sodium and potassium.
B) chlorine and sulfur.
C) calcium and sulfur.
D) chlorine and sodium.
Answer: D
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A. 0° B. 90° C. 180° D. 270° E. It does not undergo any phase shift.
If a solid has a half-filled valence band, which of the following would it be?
A. a conductor B. an insulator C. a semiconductor D. a p-type semiconductor E. an n-type semiconductor
What practical value did astronomy offer to ancient civilizations?
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Two beams of coherent light are shining on the same piece of white paper. With respect to the crests and troughs of such waves, darkness will occur on the paper where:
a. the crest from one wave overlaps with the crest from the other. b. the crest from one wave overlaps with the trough from the other. c. the troughs from both waves overlap. d. darkness cannot occur as the two waves are coherent.