The Radioactive Nuclide ²³⁵ U Decays with a T

question 12

Multiple Choice

The radioactive nuclide ²³⁵ U decays with a t _1\2 of 703.8 million years. Calculations reveal that there were 10.53 × 10 ²³ atoms of ²³⁵ U present in an initial sample. If modern spectroscopy shows that 3.25 × 10 ²¹ atoms of ²³⁵ U now exist in the sample, how long ago did the decay begin?

• A)5.9 × 10 ⁹ years ago
• B)4.1 × 10 ⁹ years ago
• C)9.8 × 10 ⁸ years ago
• D)7.6 × 10 ⁸ years ago

---

Definitions:

Contingent Consideration

An obligation of a buyer to transfer additional assets or equity interests to the seller after meeting certain conditions post-acquisition.

Liabilities

Liabilities are financial obligations or debts that a company owes to others, which are expected to be paid in the future.

Investment Account

An account designated for holding a portfolio of investments, such as stocks, bonds, real estate, and mutual funds, different from a standard savings account.

Retained Earnings

The portion of a company's profits not distributed to shareholders as dividends but kept for reinvestment in the business or to pay off debt.