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2) From the passage answer a) How is C 14 produced initially in atmosphere from Nitrogen? Write equation b) What radiation is produced when C 14 decays into Nitrogen. Write the equation. c) Explain how  half life of C 14 help us know the age of the fossil?

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2) From the passage answer a) How is C 14 produced initially in atmosphere from Nitrogen? Write equation b) What radiation is produced when C 14 decays into Nitrogen. Write the equation. c) Explain how  half life of C 14 help us know the age of the fossil?

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3) From the half life graph showing disintegrating rate a) What is the the half life of the substance in the graph. b) Explain how you did you get this answer

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3) From the half life graph showing disintegrating rate a) What is the the half life of the substance in the graph. b) Explain how you did you get this answer

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4) The content of a radioactive substance is 10g. Its half life is 2 years. a) After how many half lives would 1 g of unstable mass be left? b) Determine the approximate total mass of the contents 10 years later. Explain your answer.

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4) The content of a radioactive substance is 10g. Its half life is 2 years. a) After how many half lives would 1 g of unstable mass be left? b) Determine the approximate total mass of the contents 10 years later. Explain your answer.

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5) After 5000 years, the 20 g of Radon has very nearly completely decayed. Plot at least two more half-lives and continue the graph line to show the decay curve up to a period of 5000 years.

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5) After 5000 years, the 20 g of Radon has very nearly completely decayed. Plot at least two more half-lives and continue the graph line to show the decay curve up to a period of 5000 years.

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This question is tricky - 5000 years is not the half life. The substance completely decays in 5000 years - which is 5 half lives. Therefore what is the half life? Start from there and draw the graph in your book

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6) Why should the half life of a radioactive drug injected into the body to scan be very small?  Refer to Slide 8 and 9 of power point on carbon 14 dating and half life 

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6) Why should the half life of a radioactive drug injected into the body to scan be very small?  Refer to Slide 8 and 9 of power point on carbon 14 dating and half life 

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7) Why should the half life of Americium used to produce alpha particle in smoke detector be very long? Explain in details

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7) Why should the half life of Americium used to produce alpha particle in smoke detector be very long? Explain in details