Question

radiometric dating has wide - ranging applications. on earth, it helps geologists understand volcanic eruptions, the formation of mountain ranges, and the age of fossils. for lunar samples collected by the apollo missions, u - pb dating has provided insights into the moons history and geological processes. meteorites, which are remnants from the early solar system, have also been dated using radiometric methods. by analyzing isotopic ratios in meteorites, scientists can infer the conditions under which the solar system formed and the age of the solar system itself. in summary, radiometric dating is an invaluable tool for understanding geological time. techniques such as k - ar and u - pb dating have enhanced our ability to date igneous rocks with a significant degree of precision. however, researchers must be aware of the limitations inherent in these methods to accurately interpret the ages of geological materials. multiple choice questions 1. what isotope is primarily used in potassium - argon dating? a) argon - 40 b) potassium - 40 c) uranium - 238 d) lead - 206 2. who discovered radioactivity? a) albert einstein b) marie curie c) isaac newton d) niels bohr 3. what does uranium decay into in uranium - lead dating? a) potassium b) lead c) argon d) carbon 4. what is a key limitation of radiometric dating? a) it can only date organic materials. b) it requires a closed system. c) it is only applicable for rocks younger than 1 million years. d) it cannot be used on lunar samples. 5. what is the half - life of carbon - 14? a) 5730 years b) 1.3 billion years c) 4.5 billion years d) 100,000 years

Explanation:

1. Potassium - argon dating uses potassium - 40 which decays into argon - 40 over time.
2. Radioactivity was discovered by Marie Curie.
3. In uranium - lead dating, uranium decays into lead through a series of radioactive decay steps.
4. Radiometric dating requires a closed system, meaning no parent or daughter isotopes are lost or added during the decay process for accurate results.
5. The half - life of carbon - 14 is 5730 years.

Answer:

1. B. Potassium-40
2. B. Marie Curie
3. B. Lead
4. B. It requires a closed system.
5. A. 5730 years