A Certain Radioactive Element Has a Half-Life of 20 D

question 95

Multiple Choice

A certain radioactive element has a half-life of 20 d.The time it will take for 7/8 of the atoms originally present to disintegrate is

• A)20 d
• B)40 d
• C)60 d
• D)80 d
• E)100 d

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Definitions:

Onlooker Play

A type of play where a child watches other children play but does not join in, often seen during early childhood development.

Regression

A defense mechanism in psychology where an individual's behavior reverts to an earlier stage of development, often in response to stressful situations.

Habituation

The diminishing of a physiological or emotional response to a frequently repeated stimulus.

Prosocial Behaviors

Actions intended to benefit others, including helping, sharing, comforting, and showing compassion.