An isotope has an initial activity of 120 Bq. 6 days later its activity is 15 Bq. The half-life is?

An isotope has an initial activity of 120 Bq. 6 days later its activity is 15 Bq. The half-life is?
A. 3 days
B. 2 days
C. 1 day
D. 4 days
Correct Option: Answer is A
The equation that establishes a relationship between the amount left undecayed,

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