Physics, 24.10.2021 14:00, leeplott4747

If the activity of a source is 70 Bq after 2 years, and 35 Bq after 15 years. How long will be until the activity is 8.75 Bq?

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If the activity of a source is 70 Bq after 2 years, and 35 Bq after 15 years. How long will be until...