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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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“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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