A Sample of Radon Gas Has an Activity of 140

question 31

Multiple Choice

A sample of radon gas has an activity of 140.0 mCi. If the half-life of radon is 1,500.0 y, how long before the activity of the sample is 10.0 mCi?

• A) 1,750 y
• B) 1,510 y
• C) 7,510 y
• D) 5,170 y
• E) 5,710 y

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Definitions:

Output Instruction

A command in programming or PLC operations that controls the output of data or signals to external devices.

Motor Start

Motor start refers to the process or the set of actions initiated to begin the operation of an electric motor. This can involve mechanisms like direct on-line starters or soft starters to manage electrical load and torque.

Tags

Identifiers used in programming languages or systems, especially in PLCs, to name or reference data elements like inputs, outputs, and internal values.

Not Operating

Refers to equipment or machinery that is currently not in use or functioning.