A Rock from the Moon Was Found to Contain 1

question 104

Multiple Choice

A rock from the moon was found to contain 1.0 * 10^-5 g of uranium-238 and 4.0*10^-6 g lead-206. All of the lead-206 came from the decay of uranium-238. The half-life for this decay is
4) 5 * 10⁹ years. How old is this rock?

• A) 1 * 10⁶ years
• B) 2* 10⁷ years
• C) 4 * 10⁸ years
• D) 3 *10⁹ years
• E) 5 * 10¹⁰ years

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Definitions:

Subcontractors

Companies or individuals hired by a general contractor to perform specific tasks as part of a larger project.

Materialmen

Suppliers or sellers of materials, especially in construction, that provide goods on credit to contractors or builders.

Surety

A person or entity that takes responsibility for another's performance of an obligation or the payment of a debt in case of default.

Farm Property

is categorically land and tangible assets used in farming and agricultural operations.