P43_080 - → h the rate of electrons you would intercept is R = 7 × 10 7 h(b Let D indicate the current year(2000 2001 etc Combining Eq 43-15 and

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80. (a) Assuming a “target” area of one square meter, we establish a ratio: rate through you total rate upward = 1m 2 (2 . 6 × 10 5 km 2 )(1000 m / km) 2 =3 . 8 × 10 12 . The SI unit becquerel is equivalent to a disintegration per second. With half the beta-decay electrons moving upward, we Fnd rate through you = 1 2 ( 1 × 10 16 / s )( 3 . 8 × 10 12 ) =1 . 9 × 10 4 / s which implies (converting s
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Unformatted text preview: → h) the rate of electrons you would intercept is R = 7 × 10 7 / h. (b) Let D indicate the current year (2000, 2001, etc) Combining Eq. 43-15 and Eq. 43-17, we Fnd R = R e − t ln 2 /T 1 / 2 = ( 7 × 10 7 / h ) e − ( D − 1996) ln 2 / (30 . 2 y) ....
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This note was uploaded on 11/12/2011 for the course PHYS 2001 taught by Professor Sprunger during the Fall '08 term at LSU.

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