Home work?

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what fraction of a given sample of a radioactive nuclide remains after four half-lives?

2006-10-23 16:44:35 · 3 answers · asked by Deens 2 in Education & Reference ➔ Homework Help

3 answers

1 half-life: 1/2 left

2: half of that, or 1/4

3: half of that, or 1/8

4: half of that, or 1/16

In general: (1/2)^x, where x is the number of half-lives.

(1/2)^4 = 1/16

2006-10-23 16:46:56 · answer #1 · answered by Anonymous · 3⤊ 0⤋

1/2^4

2006-10-23 16:48:55 · answer #2 · answered by Anonymous · 1⤊ 0⤋

1-(8/16+4/16+2/16+1/16)=1/16 remains

2006-10-23 16:48:43 · answer #3 · answered by raj 7 · 1⤊ 0⤋