The activity of a sample reduces from $7.55 \times 10 ^ { 9 } \mathrm {~Bq}$ to $5.11 \times 10 ^ { 9 } \mathrm {~Bq}$ 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 $7.55 \times 10 ^ { 9 } \mathrm {~Bq}$ to $5.11 \times 10 ^ { 9 } \mathrm {~Bq}$ 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 7.55×109 Bq7.55 \times 10 ^ { 9 } \mathrm {~Bq}7.55×109 Bq

The Activity of a Sample Reduces From $7.55 \times 10 ^ { 9 } \mathrm {~Bq}$