The Decay of 514 Mg of an Isotope Is Given $A ( t ) = 514 e ^ { - 0.021 t }$

question 266

Multiple Choice

The decay of 514 mg of an isotope is given by A( $A ( t ) = 514 e ^ { - 0.021 t }$ , where t is time in years. Find the amount left after 63 years.

• A) 503 mg
• B) 134 mg
• C) 69 mg
• D) 137 mg

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Definitions:

Derived Feature

A trait that appears in recent parts of a lineage and is not present in the ancestor, contrasting with ancestral traits shared by multiple lineages.

Protect The Embryo

Mechanisms or structures that ensure the safety and development of an embryo within an organism.

Gametophytes

The haploid, gamete-producing phase in the life cycle of plants and algae.

Gymnosperms

Gymnosperms are a group of seed-producing plants that includes conifers, cycads, ginkgo, and gnetophytes, characterized by seeds that are not enclosed by a fruit.