A fossil contains 4.06 grams of carbon 14. Refer to the formulaA(t) = C 0.999879twhich gives the original amount of carbon 14 t years ago in terms of the amount C that is left now, and estimate the amount of carbon 14 in the sample 10,000 years, 20,000 years, and 30,000 years ago. (Round your answers to one decimal place.

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A: N=N0e-λt→1 T12=ln2λ ⇒λ=ln2T12=0.6931.3×109=0.533×10-9years-1

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Q: What is 28 mg coverted into kilograms? I put 2.8 e-5 and it was incorrect on Webassign.

A: 28 mg can be converted as follows.

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Q: What is Activity? Give its SI unit?

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Special Relativity

The theory of special relativity discusses how space and time are related to objects traveling along a straight line at a constant speed. Simply stated, as an object reaches the speed of light, its mass becomes infinite and it is unable to move faster than light. This interstellar speed limit has been the topic of much debate in astronomy, and also in science fiction when people consider how to fly over large distances.