problem43_63

problem43_63 - 43.63: N 87 0.693 T1 2 0.693 (4.75 10...

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43.63: 1 19 7 10 2 1 s 10 62 . 4 ) y s 10 156 . 3 ( ) y 10 75 . 4 ( 693 . 0 693 . 0 - - × = × × = = λ T 87 87 0 y) s 10 156 . 3 ( ) y 10 6 . 4 ( ) s 10 62 . 4 ( 0 0 87 0 0 87 0694 . 1 7 9 1 19 87 87 87 87 N N e N N e N N e N N t t = = = = × × × + - - - λ But we also know that = = - = = + 85 85 87 87 85 87 3856 . 0 ) 2783 . 0 1 ( 2783 . 0 2783 . 0 N N N N N N . 2920 . 0 )) 3856 . 0 ( 0694 . 1 1 ( ) 3856 . 0 ( 0694 . 1 So . 3856 . 0 87 85 87 85 0 0 0 0 = + = + N N N N So the original percentage of
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