A Certain Radioactive Substance Has a Half-Life of 75 Hours

question 88

Multiple Choice

A certain radioactive substance has a half-life of 75 hours. Find how long it will take, to the nearest hour, for 75% of the radioactivity to be dissipated if the amount of material x satisfies (t in hours) . Round your answer to the nearest hour. ​

• A)182 hours
• B)171 hours
• C)157 hours
• D)150 hours
• E)31 hours

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Definitions:

Diffusion Of Responsibility

The feeling among bystanders at an emergency that the responsibility for helping is shared by the group, making each person feel less compelled to act than if he or she alone bore the total responsibility.

Darley And Latané

Psychologists known for their research on the bystander effect, illustrating how individual responsibility is diluted in the presence of others.

Bystander Effect

A behavioral pattern observed in social psychology where people are less inclined to assist someone in need when there are others around.

Cognitive-Neoassociationistic Model

A theory proposing that cognition and emotions are linked in a network of associations, affecting how stimuli are processed and reactions are generated.