A radioactive sample has an initial activity of 6.55 x 10°Bq (1Bq is one disintegration per second). Four hours later the sample has an activity of 1.02 × 10® Bq. What is the half-life of the material? (a) 10 minutes (b) 20 minutes (c) 30 minutes (d) 40 minutes

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A radioactive sample has an initial activity of 6.55 × 10º Bq (1Bq is one disintegration per
second). Four hours later the sample has an activity of 1.02 × 10® Bq. What is the half-life of the
material?
(a) 10 minutes
(b) 20 minutes
(c) 30 minutes
(d) 40 minutes
Transcribed Image Text:A radioactive sample has an initial activity of 6.55 × 10º Bq (1Bq is one disintegration per second). Four hours later the sample has an activity of 1.02 × 10® Bq. What is the half-life of the material? (a) 10 minutes (b) 20 minutes (c) 30 minutes (d) 40 minutes
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