problem43_24

problem43_24 - 43.24: a) dN dt 500 Ci (500 10 6 )(3.70 1010...

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43.24: a) ) s 10 70 . 3 )( 10 500 ( Ci 500 1 10 6 - - × × = = μ dt dN s dec 10 85 . 1 7 × = dt dN s 10 6.69 d) s (86,400 12 2 ln 2 ln λ λ 2 ln 7 2 1 2 1 - × = = = = d T T nuclei 10 77 . 2 s 10 69 . 6 s / dec 10 85 . 1 λ λ 13 1 7 7 × = × × = = = - - dt dN N N dt dN The mass of this 131 many Ba nuclei is ) nucleus kg 10 66 . 1 131 ( nuclei 10 77 . 2 27 13 - × × × × = m ng 0 . 6 g 10 0 . 6 kg 10 0 . 6 9 12 = × = × = - - (b) t e A A λ 0 - = days 108 s 400 , 86 d 1 s 10 29 . 9 s 10
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This note was uploaded on 05/12/2008 for the course PHYS 262 taught by Professor Dougherty during the Spring '08 term at Lafayette.

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