A Radioactive Material Initially Is Observed to Have an Activity

question 72

Multiple Choice

A radioactive material initially is observed to have an activity of 1 000 decays/sec.If three hours later it is observed to have an activity of 125 decays/sec,what is its half-life?

• A)1/2 hour
• B)1 hour
• C)3 hours
• D)8 hours

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Definitions:

Vision Deficiency

Any range of conditions that impair the clarity, focus, or perception of vision, affecting one’s ability to see normally.

Excessive Blinking

A condition characterized by an abnormally high frequency of eyelid closure.

Thumb-Finger Grasp

A motor skill where the thumb and one or more fingers meet to hold an object, often seen in early child development.

Transfer Objects

In programming, it refers to simple objects used to transport data between layers and tiers of an application.