# Chapter 30 - Nuclear Physics and Radioactivity - Misconceptual Questions: 8

Choice E.

#### Work Step by Step

After each half-life, one-half of the remaining material decays. After one half-life, one day, we are down to one-half the original amount. After two half-lives, 2 days, we are down to one-quarter the original amount. After three half-lives, 3 days, we are down to one-eighth the original amount. This means that 7/8 of the original sample has decayed.

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