lalissanagomes2208 lalissanagomes2208

17-10-2021
Physics

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2. A sample of strontium-90 has an activity of 5000 Bq. After 120 years the activity has fallen to 625 Bq. What is the half life of strontium-90?

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rejoiceeniola35 rejoiceeniola35

23-10-2021

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the one with the highest speed

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