Problem: The approximate date of an earthquake that occured in a remote region before recorded history is determined by measuring the 14C activity in parts of a tree uprooted by the quake. The 14C activity is 11.2 disintegrations/min•gC in the tree. A living tree has a activity of 15.3 disintegrations/min•gC. How long ago did the eathquake occur? t 1/2 of 14C = 5730 yr. (a) 32,100 yr (b) 1790 yr (c) 599 yr (d) 1580 yr (e) 2580 yr

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The approximate date of an earthquake that occured in a remote region before recorded history is determined by measuring the 14C activity in parts of a tree uprooted by the quake. The 14C activity is 11.2 disintegrations/min•gC in the tree. A living tree has a activity of 15.3 disintegrations/min•gC. How long ago did the eathquake occur? t 1/2 of 14C = 5730 yr.

(a) 32,100 yr

(b) 1790 yr

(c) 599 yr

(d) 1580 yr

(e) 2580 yr

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