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Dirac sea

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In relativistic quantum mechanics, the completely filled, infinite set of negative energy electron states that makes up a vacuum. If a negative energy electron is promoted to a positive energy state, the hole it leaves behind has the properties of a positron.
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QUIZ YOURSELF ON "WAS" VS. "WERE"!
Were you ready for a quiz on this topic? Well, here it is! See how well you can differentiate between the uses of "was" vs. "were" in this quiz.
Question 1 of 7
“Was” is used for the indicative past tense of “to be,” and “were” is only used for the subjunctive past tense.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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