The Activity of a Sample Reduces from 7 $10 ^ { 9 }$

question 59

Short Answer

The activity of a sample reduces from 7.55 × $10 ^ { 9 }$ Bq to 5.11 × $10 ^ { 9 }$ Bq in 5.50 months.
(a)What is its half life?
(b)How many months from the start must one wait for the activity to decrease to 10% of its original value?

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Definitions:

Monozygotic Twins

Identical twins resulting from a single fertilized egg splitting into two, sharing the exact genetic makeup.

Secondary Sex Characteristics

are features that distinguish the two sexes of a species, but are not directly involved in reproduction, such as body hair or voice pitch.

Gonad

A reproductive gland that produces gametes (sperm in males and eggs in females) and sex hormones, such as testes in males and ovaries in females.

Chromosomes

Chromosomes are long strands of DNA and proteins found in the nucleus of most living cells, carrying genetic information in the form of genes.