A Certain Substance Has a Half-Life of 5

question 29

Multiple Choice

A certain substance has a half-life of 5.0 hours. How many nuclei of the substance are required to give an initial activity of 6.0 μCi? 1 Ci = 3.7 × Bq.

• A) 5.8 × 10⁹
• B) 8.5 × 10⁸
• C) 6.3 × 10⁸
• D) 3.2 × 10⁹
• E) 2.4 × 10⁹

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Definitions:

Type of Therapy

Refers to various treatments or interventions designed to alleviate symptoms, treat disease, or improve well-being.

Genome

The complete set of genetic material, including all the genes, present in an organism or a cell.

Humans

Homo sapiens, the only extant species of the genus Homo, characterized by advanced cognitive abilities and the capacity for culture and language.

Fruit Flies

Small flies, often used as model organisms in genetic research, belonging to the genus Drosophila.