Suppose 40% of a Radioactive Substance Remains After 2 Years

question 10

Multiple Choice

Suppose 40% of a radioactive substance remains after 2 years.Assume that ln 0.4 = -0.9 and find the decay constant.

• A) 0.225
• B) 0.45
• C) 0.6
• D) 1.8
• E) 3.6

---

Definitions:

Propanoic Acid

An organic carboxylic acid with the chemical formula C3H6O2, known for its foul odor and use in food preservatives.

Organic Halide

Organic compounds containing one or more halogen atoms (fluorine, chlorine, bromine, or iodine) attached to carbon atoms, widely used in organic synthesis and industrial applications.

Cyanide Ion

A negatively charged ion (CN-) known for its high toxicity; it is composed of one carbon atom triple-bonded to a nitrogen atom.

Nitrile Hydrolysis

Nitrile hydrolysis is a chemical reaction where a nitrile group (C≡N) is converted into a carboxylic acid or its derivatives through the addition of water (H2O).