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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The Answer of 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?

The Activity of a Sample Reduces from 7 10910 ^ { 9 }109

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