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D-s particle

[ dēĕs ]
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A positively charged meson having a mass 3,852 times that of the electron and a mean lifetime of approximately 4.7 X 10-13 seconds. See Table at subatomic particle.
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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.

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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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