A sample of a dish from an archaeological dig gave 18,500 disintegrations per gram of carbon per day. A 1.00 g sample of carbon from a modern source gave 22,080 disintegrations per day. If the decay constant of carbon-14 is 1.2 x 10-4 y-1, what is the age of the dish?
a) 640 y
b) 8300 y
c) 68,000 y
d) 30,000 y
e) 1,500 y
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