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Home Q & A Board Science-Related Homework Help Physics Astronomy
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hermiz hermiz
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6 years ago
A rock sample contains 1/4 micrograms of the parent radioactive isotope K-40 and 3/4 micrograms of its daughter isotope Ar-40. If the half-life of this decay is 1.25 billion years, how old is this rock?
A) 5.00 billion years
B) 3.75 billion years
C) 1.25 billion years
D) 2.50 billion years
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Life in the Universe

Life in the Universe


Edition: 4th
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Life in the Universe, 4/E (Bennett, Shostak)
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19Clyde19Clyde
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hermiz Author
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6 years ago
Correct Slight Smile TY
vernonb
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Yesterday
I appreciate what you did here, answered it right Smiling Face with Open Mouth
SupremeDJ
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2 hours ago
this is exactly what I needed
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