All the Disintegrations of a Sample of an Unknown Nuclide

question 68

Multiple Choice

All the disintegrations of a sample of an unknown nuclide weighing 4.6 × 10^-2 g were counted. In the first half-life of the sample, the total number of disintegrations counted was 4.3 × 10²⁰. What is the atomic weight of the unknown element?

• A) 32 amu
• B) 16 amu
• C) 8 amu
• D) 4 amu
• E) none of the above

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Definitions:

Cognitive Psychologist

A professional who studies mental processes such as "attention, language use, memory, perception, problem-solving, creativity, and thinking."

Information Processing

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Psychology

The examination of human mental processes and their roles, especially in regards to how they determine behavior in certain environments.