All the Disintegrations of a Sample of an Unknown Nuclide

question 68

Multiple Choice

All the disintegrations of a sample of an unknown nuclide weighing 4.6 × 10^-2 g were counted. In the first half-life of the sample, the total number of disintegrations counted was 4.3 × 10²⁰. What is the atomic weight of the unknown element?

• A) 32 amu
• B) 16 amu
• C) 8 amu
• D) 4 amu
• E) none of the above

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Definitions:

Quantitative Trait Locus (QTL)

Quantitative trait locus (QTL) is a stretch of DNA that is correlated with variation in a phenotypic trait. These regions contain genes, or are linked to genes, that contribute to population differences in a phenotype.

Phenotypic Trait

An observable and measurable characteristic of an organism, which can result from its genetic makeup and environmental influences.

DNA

DNA, or deoxyribonucleic acid, is a molecule that contains the instructions an organism needs to develop, live, and reproduce.

Population Differences

Variations in genetic makeup, traits, or behaviors among different groups within a species, often due to environmental factors or genetic drift.