A Radioactive Material Initially Is Observed to Have an Activity

question 58

Multiple Choice

A radioactive material initially is observed to have an activity of 1 600 decays/s.If six hours later it is observed to have an activity of 400 decays/s,what is its half-life?

• A)six hours
• B)three hours
• C)twelve hours
• D)seven hours
• E)​not enough information

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Definitions:

Learned Helplessness

The experience of feeling helpless, which is often a consequence of either going through a traumatic occurrence or consistently failing to succeed.

Internal Locus of Control

A psychological concept where an individual believes that they have control over the events in their life and their own behavior.

Experimental Research

A methodology in scientific studies where variables are manipulated and controlled to determine their effects on other variables.

Correlational Research

A research method that examines the relationship between two or more variables to determine if there is an association between them.