Examlex
Choose the one alternative that best completes the statement or answers the question.
-The half-life of a radioactive element is 130 days, but your sample will not be useful to you after 80% of the radioactive nuclei originally present have disintegrated. About how many days can you use the sample?
Nanometers
A unit of measurement equal to one billionth of a meter, often used to specify the size of particles or wavelengths in the field of nanotechnology and physics.
Picometers
A unit of length in the metric system equal to one trillionth of a meter, often used to measure atomic and molecular sizes.
Micrometers
Units of measurement equal to one-millionth of a meter, commonly used in science to measure microorganisms or cellular structures.
Capsid
Protein coat surrounding the nucleic acid of a virus.
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