How Many Days Are Required for a Radioactive Sample, with a Half-Life

question 6

Multiple Choice

How many days are required for a radioactive sample, with a half-life of 5.7 d and an initial activity of 1.07 × 10⁵ Bq, to decay to an activity of 100 Bq?

• A) 57 d
• B) 46 d
• C) 68 d
• D) 39 d

---

Definitions:

Motor Development

The progression of muscle coordination and strength in children, allowing them to perform more complex physical activities over time.

Cognitive Deficit

Impairment in mental processing abilities such as memory, attention, problem-solving, and decision-making.

Normal Aging

The natural and gradual changes in physical, cognitive, and social abilities that occur as part of the aging process.

Secure Attachment

A stable and healthy emotional bond between a child and their caregiver, characterized by trust and a sense of safety.