Radon-222 Has a Half-Life of 3

question 46

Multiple Choice

Radon-222 has a half-life of 3.82 days. How many alpha emissions would have occurred when a 10 g of radon-222 sample decays over 19.1 days?

• A) 3.39 × 10²⁰ emissions
• B) 8.47 × 10²⁰ emissions
• C) 5.42 × 10²¹ emissions
• D) 2.62 × 10²² emissions
• E) 4.18 × 10²⁵ emissions

---

Definitions:

Visual Imagery

The process of forming mental pictures or images in one's mind, which can enhance memory, creativity, and understanding of concepts.

Baddeley's Model

A model of working memory proposed by Alan Baddeley, which consists of three main components: the central executive, the phonological loop, and the visuospatial sketchpad.

Working Memory

A mental mechanism with finite capabilities, aimed at briefly storing information for subsequent processing tasks.

Short-Term Memory

The capacity for holding a small amount of information in an active, readily available state for a short period.