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NvidiaIntely (nvidiaintely):
A rock has 12.5 percent of its original amount of potassium-40 remaining in it; potassium-40 has a half-life of 1.25 billion years. How long ago was the rock formed? 1.25 billion years ago 2.5 billion years ago 3.75 billion years ago 5 billion years ago
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NvidiaIntely (nvidiaintely):
@Kevin
OpenStudy (kevin):
Nt = 12.5/100 No Nt/ No = 12.5/100 Nt/No = 1/2(t/ delta t) 12.5/100 = 1/2(t/1.25) t = 3.75
NvidiaIntely (nvidiaintely):
Thanks!
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