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i received many itunes gift cards over the christmas period and i was just wondering if i could buy amazon ebooks for my ipad with itunes credit insted of a credit card? i know i could just buy books from ibooks but amazon has a larger variety. thanks x

The half life of a radioactive isotope is 6 hours. It has an activity of 800 counts/second. What is the activity after two days? Its activity two days later would be 50 counts/second. But Why???