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radioactive substance

1. Solve the following problem. Show your work:
A certain radioactive substance has a half-life of 8 seconds. If you start out with 200,000 g of this substance, how much will be left after 64 seconds?
2. In responding to the questions below, please provide us with some insight into why think this or how you arrived at your response.
A) If an atom was the size of a two-story house about how large would the nucleus be?
B) If an atom was the size of a football stadium about how large would the nucleus be?
C) If the Earth was the size of a softball, about how large and about how far away would the Sun be?
D) If the Earth was the size of a softball, about how large and about how far away would the Moon be?
E) You might find a visit to this site interesting: http://micro.magnet.fsu.edu/primer/java/scienceopticsu/powersof10/index.html.