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    hkey123's Avatar
    hkey123 Posts: 1, Reputation: 1
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    Jan 15, 2012, 01:52 PM
    How many atoms will remain in 352 years?
    Dr. Brown has a radio isotope source containing 1.2x10 to the 6th power atoms of plutonium238 & 1985. How many atoms will remain in 352 years?
    ebaines's Avatar
    ebaines Posts: 12,131, Reputation: 1307
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    Jan 16, 2012, 11:07 AM
    The number of atoms remaining depends on the number you start with and the material's half-life, T_HL:



    The key is finding the value for T_HL for Plutonium - you can probably find that value in your text book.
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