(III) decays with a half-life of about 53 d. It is
Chapter 30, Problem 58P(choose chapter or problem)
(III) \({ }_{4}^{7} \mathrm{Be}\) 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
\(350 \text { decays } / \mathrm{s}\) of \({ }_{4}^{7} \mathrm{Be}\), (a) how long do we have to wait for the decay rate to drop to 25 per second? (b) Estimate the initial mass of \({ }_{4}^{7} \mathrm{Be}\) on the leaf.
Equation Transcription:
Text Transcription:
4 ^ 7Be
350 decays/s
4 ^ 7Be
4 ^ 7Be
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