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74Be decays with a half-life of about 53 d. It is produced in the upper atmosphere, and filters down onto the Earth's surface.
74Be decays with a half-life of about 53 d. It is produced in the upper atmosphere, and filters down onto the Earth's surface.If a plant leaf is detected to have 350 decays/s of 74Be, how long do we have to wait for the decay rate to drop to 25 per second?
Answer:201.8 daysExplanation:The activity of a radioactive sample as a function of times is :Here,= the initial activity= half lifet = elapsed timeNow rearranging the equation for time, t, we get:= 201.8 daysTherefore, the required time is 201.8 days...
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