The Half-Life of a Particular Radioactive Isotope of Element X

question 77

Multiple Choice

The half-life of a particular radioactive isotope of element X is 100 years.If you know that 400 years ago a fossil contained 10 mg of this isotope, you would expect to find about _______ mg in that fossil today.

• A) 5
• B) 2.5
• C) 0.6
• D) 0.3
• E) 0.15

---

Definitions:

Parent Cell

A cell that divides to give rise to daughter cells through the processes of mitosis or meiosis, serving as the original source for the genetic material.

Oncogene

Gene that helps transform a normal cell into a tumor cell.

Tumor Cell

A cell that has undergone transformation leading to uncontrolled division, which can form a mass or neoplasm potentially leading to cancer.

Malignant Cells

Cells that are cancerous and have the ability to invade other parts of the body.