contestada

1. Radioactive decay of 40K atoms in an igneous rock has resulted in a ratio of 25 percent 40K atoms to 75 percent 40Ar and 40Ca atoms. How many years old is this rock?

Respuesta :

1/2 of the original parent has decayed, thus one half- life has passed, and the rock is 1.3 billion = 1300 million years old

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