Radon-222 Has a Half-Life of 3

question 33

Multiple Choice

Radon-222 has a half-life of 3.8 days. A sample from a basement in Colorado was analyzed 5.0 days after it was collected and found to have an activity of 0.17 Bq. What was the original activity of this sample?

• A)0.22 Bq
• B)0.32 Bq
• C)0.42 Bq
• D)0.62 Bq
• E)0.52 Bq

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Definitions:

Hermann Von Helmholtz

A German physicist and physician known for his contributions to the understanding of the conservation of energy, optics, and acoustics.

Thomas Young

A British polymath known for his contributions to the fields of vision, light, solid mechanics, energy, physiology, and language.

Ganglion Cell

Ganglion cell refers to a type of neuron located in the retina that receives visual information from photoreceptors via bipolar cells and transmits it to the brain through the optic nerve.

Bipolar Cell

A type of neuron found in the retina of the eye, acting as an intermediary cell that transmits signals from the photoreceptors to the ganglion cells, which then send information to the brain.