The Radioactive Isotope Tritium Decays with a First-Order Rate Constant

question 17

Multiple Choice

The radioactive isotope tritium decays with a first-order rate constant k of 0.056 yr^-1. What fraction of the tritium initially in a sample is still present 30. years later?

• A) 0.19
• B) 0.60
• C) 0.15
• D) 2.8 × 10^-38
• E) 0.81

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Definitions:

Carbon Dioxide

It's a transparent, unscented gas formed through the burning of carbon-containing compounds and the act of breathing, which is assimilated by plants in the photosynthesis process.

Bicarbonate Ions

Bicarbonate ions (HCO3-) act as a buffer in biological systems, helping to maintain pH balance in blood and other bodily fluids.

Carbonic Anhydrase

An enzyme that catalyzes the conversion of carbon dioxide and water into carbonic acid, playing a vital role in respiratory gas exchange and pH balance.

Carbonic Anhydrase Inhibitor

A class of pharmaceuticals that suppress the activity of carbonic anhydrase, thereby reducing fluid pressures in the eye, among other effects.