Posted by **Anonymous** on Monday, December 5, 2011 at 2:53pm.

A particular radioactive substance has a half-life of 4 minutes. How long will it take for 250 g of this radioactive material to decay to less than 0.1g?

24 min

36 min

40 min

48 min

72 min

I got 32 min but that not one of the choices. Please help

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