A sample of ancient granite crust is dated using potassium-40. Scientists find that 50% of the potassium-40 has decayed to form

Question

xz_007 [3.2K]

3 years ago

12

A sample of ancient granite crust is dated using potassium-40. Scientists find that 50% of the potassium-40 has decayed to form

argon-40. Approximately how old is this rock?

Physics

2 answers:

ad-work [718] · Answer 1 · 2022-03-23T18:42:56+03:00

ad-work [718]3 years ago

7 0

The answer is 1.3 billion years old

damaskus [11] · Answer 2 · 2022-03-23T16:54:12+03:00

The find the approximate age of the granite one must know the half-life of potassium-40. The half-life of an element is the period of time in which half atoms of the same substance changes into the isotope of the element. The isotope of potassium-40 is Argon 40. Potassium-40 has a half-life of approximately 1.3 billion years. The rock is approximately 1.3 billion years old.