Question
____ the amount of time required for half of a sample of radioactive nuclei to decay.
Answer
Half-life the amount of time required for half of a sample of radioactive nuclei to decay.
Or, the time it takes to reduce the radioactivity of a substance by half
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____ are physical quantities that have both magnitude and direction .
Vectors are physical quantities that have ____ .
____ are quantities that have only a magnitude .
Scalars are quantities that have ____.
For vector addition , use the ____.
For vector ____, use the tip-to-tail method, or you can break the vector into its component parts and use the Pythagorean Theorem.