A Glass Container Holds Equal Numbers of Atoms of Phosphorus

question 19

Multiple Choice

A glass container holds equal numbers of atoms of phosphorus 30 with a half-life of 2.5 minutes and of nitrogen 13 with a half-life of 10 minutes.After 20 minutes the ratio of the number of nitrogen atoms remaining to the number of phosphorus atoms remaining is

• A) .
• B) .
• C) .
• D)64.
• E)256.

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