1. If I throw sixty different dice (compared to an atomic nucleus) and each dice that gets a 3 is disintegrated and disappear before the next roll. Altogether I make ten roll, where each roll corresponds to one day. The result is illustrated in a graph: http://imgur.com/TbXF4mf click on the picture to see. X = time in days, Y = decays under a day These questions must be answered: a) How can I read and calculate the half-life through my function expression? b) What is the function expression? c) the relationship between nuclei activity d) The difference between a nucleus and dice? 2. No equations given. 3. The half-life must surely be somewhere between the third and fourth day (throw). But how can I calculate it exactly by reading? Functional expression is well in my graph: 15.19 * e ^ -0,25x. This is indeed a exponentiellfunktion, if I understand correctly? How can I get out activity between nuclei I have not decay constant? The last question I do not understand at all ..