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Choose and Interpret Units in Formulas
Grade Level
Praxis Core
5165.019 Choose and Interpret Units in Formulas
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A half-life model is N = N0 2^(t/T), where t is hours. Which units should T have?
A
per hour, so that t/T has hours squared
B
hours, so that t/T is unitless
C
unitless, because it is in an exponent
D
counts, so that N and N0 match
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