• Puzzle solutions are due by Midnight on Sunday of each week.
• Puzzles are worth 5 points of extra credit each.
• Answers must be accompanied by valid reasoning. Just like the tests, the answer alone isn't enough!
• Each week, the first student to submit a correct answer will recieve the stylish P202 T-shirt.
• Previous winners get a "virtual t-shirt." No shirt, but a chance to win a prize with actual value at the end of the semester (often a book, or maybe software).
• Please enter your solution in the text area at the bottom of this page.

"Shopping Spree"

You are ordering a sample of uranium (238) for your lab, and you know that you need a piece with an activity of 3 x 10⁶ Bq. Given tht the half-life of this isotope is 4.47 billion years, what mass sample should you order?

Don't forget to explain your answer as clearly as possible.

Please type your last name and first initial (e.g., Gavrin, A):

Please type your Student ID Number:

Please type a nickname: (in case your answer gets used in class).