In one of the rocks brought back from the moon it is found, Physics

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In one of the rocks brought back from the moon it is found

In one of the rocks brought back from the Moon, it is found that70.7 percent of the initial potassium-40 in the rock has decayed to argon-40.

(a) If the half-life for this decay is 1.2 109 years, determine how old is the rock?

___________? y

(b) find how much longer will it take before only 8.5percent of the original potassium-40 is still present in the rock?

___________? y

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Physics: In one of the rocks brought back from the moon it is found

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