A Sample Containing $4.0 \times 10 ^ { 18 }$ Atoms of a Radioactive Isotope Decays with a Half-Life Of Atoms

question 147

Multiple Choice

A sample containing $4.0 \times 10 ^ { 18 }$ atoms of a radioactive isotope decays with a half-life of $2.3$ years. How many undecayed atoms are left after $3.7$ years?

• A) \(1.7 \times 10 ^ { 18 }\)
• B) \(1.3 \times 10 ^ { 18 }\)
• C) \(2.5 \times 10 ^ { 18 }\)
• D) \(1.1 \times 10 ^ { 18 }\)

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Definitions:

Apartheid

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South Africa

A country located at the southern tip of the African continent, known for its diverse cultures, languages, and significant history of apartheid until the early 1990s.

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