half-life 1 (Radio-30) The half-life ('HWZ') One of them Isotopes of which: 10 years. After How many years (expressed as in 'Full-multiple The HWZ') is of The originally of which: Number of Atoms Not yet the following: Quantity received The Heleventh a Quarter a 128- What is this? about. 1 Percentage about. 1 Prometheus about. a One millionth

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The half-life ('HWZ') One of them Isotopes of which: 10 years. After How many years (expressed as in 'Full-multiple The HWZ') is of The originally of which: Number of Atoms Not yet the following: Quantity received

1. The Heleventh
2. a Quarter
3. a 128- What is this?
4. about. 1 Percentage
5. about. 1 Prometheus
6. about. a One millionth

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Hinweis: Firstly question Not at all: How many half-lives are past?

Lösung:

1. The Heleventh: One HWZ is expired, This means that 10 years
2. a Quarter: Total two HWZ, So what do you mean? 20 years
3. a 128- What is this?: Total seven HWZ, So what do you mean? 70 years
4. about. 1 Percentage: So what do you mean? about. a One-hundredth. 1/64 would be 6 HWZ, 1/128 would be 7 HWZ, So what do you mean? between 60 – 70 years
5. about. 1 Prometheus: So what do you mean? about. a One thousandth. 9 HWZ (=1/512), 10 HWZ (1/1024), This means that between 90 – 100 years
6. about. a One millionth: 2^x=1'000'000, x between 19 and 20. So what ? This means that 190 – 200 years. exercise can also without Mathematics solved will be, on to the Machinery and apparatus for the manufacture of paper pulp 2^x Try it, to Greater as One One million.

   With Mathematics: 2^x =1'000'000, x = log(1'000'000)/log(2) = 19.93

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