A 1.00 g charcoal sample from an ancient fire has a 14C activity of 11.2 disintegrations/min. A living tree has a 14C activity of 15.3 disintegrations/min per gram. The half-life of 14C is 5730 y. How old is the charcoal sample?
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Ответ:
The answer is (D): When the current flows up the wire, the magnetic field flows in on the left side of the wire and out on the right side of the wire.
Explanation: