abhibhambhani
26.03.2021 •
Biology
Potassium-40 has a half-life of 1.3 billion years. If a rock was
determined to be around 3.9 billion years old what percentage
of the original potassium-40 would be left in that rock sample?
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Ответ:
The 3.9 billion year old rock has undergone three half-lives (3.9 divided by 1.3 = 3). After 3 half-lives, 12.5% of the potassium-40 remains undecayed.
Ответ:
There are six trigonometric ratios, sine, cosine, tangent, cosecant, secant and cotangent.
Step-by-step explanation: