A Radioisotope Placed near a Radiation Detector Registers 80 Counts

question 109

Essay

A radioisotope placed near a radiation detector registers 80 counts per second. Eight hours later the detector registers 5 counts per second. What is the half-life of the radioisotope?

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Definitions:

Projective Techniques

Psychological assessment tools that use ambiguous stimuli to elicit responses that are thought to reveal hidden aspects of an individual's personality.

Personal Needs

Basic requirements for individual well-being, such as food, water, safety, as well as psychological longings like love, esteem, and self-actualization.

Ambiguous Stimulus

A sensory input that lacks clear, definitive features, making its interpretation subject to individual perception or context.

Validity

The extent to which an assessment device measures what it is intended to measure.