47. We note that 3.82 days is 330048 s, and that a becquerel is a disintegration per second (see §42-3). From Eq. 34-19, we have NRTVV==×FHGIKJ=×12531032155 10330048274 10ln.ln.Bqmsatomsmwhere we have divided by volume v. We estimate v(the volume breathed in 48 h = 2880 min) as follows: 2110002880
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