A Pure Sample of ²²⁶Ra Contains 2

question 54

Multiple Choice

A pure sample of ²²⁶Ra contains 2.3 × 10¹³ atoms of the isotope.If the half-life of ²²⁶Ra = 1.6 × 10³ years,what is the activity of this sample?

• A)1.4E+10 decays/yr
• B)1.0E+10 decays/yr
• C)3.2E+2 decays/yr
• D)3.7E+16 decays/yr
• E)​6.2E+6 decays/yr

---

Definitions:

Dome

An architectural element that resembles the upper half of a sphere, often used to cover a large space.

Tempietto

A small Renaissance temple in Rome, designed by Donato Bramante, considered a masterpiece of High Renaissance architecture.

Commissioned

Refers to the act of officially appointing or hiring someone to perform a specific task or create a specific piece of work.

Rendition

The process of interpreting or performing a piece of music or art, or the act of surrendering a person from one jurisdiction to another.