A Radioactive Isotope Has a Lifetime of 6

question 57

Multiple Choice

A radioactive isotope has a lifetime of 6.30 min.If you begin with a sample of 2.50 moles of this isotope,how many atoms have you left after one hour?

• A)1.10 * 10²⁰
• B)4.5 * 10¹⁴
• C)2.05 * 10²¹
• D)None are correct.

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Definitions:

Nonsense Syllables

Sequences of letters that do not form known words, used in memory and learning experiments to study the processes of encoding and recall.

Hermann Ebbinghaus

A German psychologist who is best known for his research on memory and the forgetting curve.

Sensory Storage

The shortest-term element of memory, which allows the retention of impressions of sensory information after the original stimuli have ended.

Constructive Processing

The way in which our memory reconstructs past events, often influenced by current knowledge, feelings, and thoughts.