Answered

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Suppose you have a one-gram sample of potassium-40
and a one-gram sample of uranium-235. After 1 billion years, why would there be
more potassium-40 than uranium-235?

Sagot :

tcs1299821

Answer:

Potassium-40 (40K) is a radioactive isotope of potassium which has a long half-life of 1.251×109 years. It makes up 0.012% (120 ppm) of the total amount of potassium found in nature.

...

Potassium-40.

General

Natural abundance 0.0117(1)%

Half-life 1.251(3)×109 y

Parent isotopes Primordial

Decay products 40Ca (β−) 40Ar (EC, γ; β+)

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