A Certain Radioactive Substance Has a Half-Life of Years

question 46

Short Answer

A certain radioactive substance has a half-life of years. Approximately how many years will it take so that only of the original amount remains? Round your answers to six decimal places.

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Definitions:

Diameter

The straight line passing from side to side through the center of a body or figure, especially a circle or sphere, and representing the maximum distance between sides.

External Threads

Threads on the outside of a cylindrical surface, designed to fit into a corresponding part with internal threads.

Internal Threads

Threads located on the inside surface of a hole, designed to mate with external threads on a bolt or screw.

Die Cuts

Precise shapes cut from various materials using a die or mold.