Calcium-39 Undergoes Positron Decay

question 89

Multiple Choice

Calcium-39 undergoes positron decay. Each positron carries 5.49 MeV of energy. How much energy will be emitted when 0.00250 mol of calcium-39 decays? (1 MeV = 1.602 × 10^-13 J)

• A) 13.2 kJ
• B) 1.32 × 10⁴ kJ
• C) 1.32 × 10⁶ kJ
• D) 1.32 × 10⁹ kJ
• E) None of these choices is correct.

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FIFO Cost Flow

An inventory valuation method where the cost of the oldest inventory items are the first to be recorded as sold.

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The total value of all inventory items in stock at the end of an accounting period.