p43_030 - 30. (a) Replacing differentials with deltas in...

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Unformatted text preview: 30. (a) Replacing differentials with deltas in Eq. 43-11, we use the fact that ∆N = −12 during ∆t = 1.0 s to obtain ∆N = −λ∆t =⇒ λ = 4.8 × 10−18 /s N where N = 2.5 × 1018 , mentioned at the second paragraph of §43-3, is used. (b) Eq. 43-17 yields T1/2 = ln 2/λ = 1.4 × 1017 s, or about 4.6 billion years. ...
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