When Uranium Disintegrates into Lead, One Step in the Process

question 54

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 2 and E is reduced by 14%.

• A)increases 1,428.57%
• B)increases 281.40%
• C)increases 255.81%
• D)increases 175.44%
• E)increases 232.56%

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Definitions:

Dreams

A sequence of thoughts, images, and sensations occurring in a person's mind during sleep.

NREM Sleep

A phase of sleep characterized by non-rapid eye movement, consisting of stages 1-3, each deeper than the last, and associated with physical and mental restoration.

REM Sleep

A unique phase of sleep characterized by rapid eye movements, low muscle tone, and vivid dreams, playing a key role in emotional regulation and memory.

Vivid Dreams

Highly detailed, clear, and sometimes intensely emotional dreams that are remembered upon awakening.