Solved

When Uranium Disintegrates into Lead, One Step in the Process

question 96

Multiple Choice

When uranium disintegrates into lead, one step in the process is the radioactive decay of radium into radon gas. Radon enters through the soil into home basements, where it presents a health hazard if inhaled. In the simplest case of radon detection, a sample of air with volume V is taken. After equilibrium has been established, the radioactive decay D of the radon gas is counted with efficiency E over time t. The radon concentration C present in the sample of air varies directly as the product of D and E and inversely as the product of V and t. For a fixed radon concentration C and time t, find the change in the radioactive decay count D if V is multiplied by 4 and E is reduced by 20%.

Definitions:

Currency Exchange Rates

The monetary value of one currency in the form of another during conversion.

Equivalent Amount

A sum of money that has the same value as another, especially in different currencies or at different times, adjusted for factors like inflation.

First Column

In data presentation or spreadsheet context, this refers to the initial column on the left side, often used for the primary classification or identification of rows.

Second Column

Refers to the column positioned immediately after the first in a table, chart, or spreadsheet, often containing related or detailed information.