A Sample of Fluorine-20 Has an Activity of 5

question 67

Multiple Choice

A sample of fluorine-20 has an activity of 5.94 mCi. If its half-life is 11.0 s, what is its activity after 55.0 s?

• A) 0.816 mCi
• B) 0.861 mCi
• C) 0.168 mCi
• D) 0.186 mCi
• E) 0.618 mCi

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Definitions:

Tasks

Specific pieces of work or activities that are to be accomplished within a given timeframe.

EEG

Electroencephalography, a method used to record electrical activity of the brain through electrodes placed on the scalp.

Analogy

A comparison between two things, typically for the purpose of explanation or clarification.

Neurotransmitter

Chemical messengers that transmit signals across a chemical synapse from one neuron (nerve cell) to another 'target' neuron, muscle cell, or gland cell.