Mathematics, 26.06.2020 15:01 mwshehat0

If a radioactive element has a half-life of 40 minutes. initial count rate was 1000 per minute, then how long will it take for count rate to drop to 125 per minutes?

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If a radioactive element has a half-life of 40 minutes. initial count rate was 1000 per minute, then...

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