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chrisgaz14
16.10.2020 •
Chemistry
Element Y has a half-life of 120 years. If you started off with a sample of 280 atoms of Element Y, how many would be left
after 3 half-lives?(select answer one of the choices)
A)70
B)140
C)28
D)35
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Ответ:
Ответ:
la energía térmica está contenida en la roca y los fluidos debajo de la corteza terrestre