A Sample That Contains 5

question 9

Multiple Choice

A sample that contains 5.7×10 ^{- 9} mol of ⁹³Zr decays at a rate of 3.02×10³ disintegrations per minute. What is the half-life of ⁹³Zr?
(1 year = 5.256×10⁵ minutes)

• A) 1.0×10⁶ years
• B) 1.5×10⁶ years
• C) 2.2×10⁶ years
• D) The half-life cannot be found from this information.
• E) none of these

---

Definitions:

Balance Per Company's Records

This refers to the amount shown in a company's financial records or accounting books.

Balance Per Books

The ending balance in a company's accounting records for a specific account.

Notes Collected

Receipts from the collection of promissory notes, representing cash inflows from financial claims against others.

Balance Per Books

The amount of money shown in the company's financial records, not necessarily reflecting cash available or actual account balances due to outstanding transactions.