Activity & decay

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Katie2000
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#1
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Long half lives are measured using the principle of activity. If 3.0mg of 239Pu has an activity of 6.9×106Bq, calculate the half life of 239Pu. Give your answer in years to 2 significant figures (strictly the answer to this question should be given to 1 sig fig, but 2 sig figs allows us to check your method is correct)
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Jakir
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http://physicsnet.co.uk/a-level-phys...oactive-decay/

Use the equations available here and have a go
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Katie2000
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(Original post by Jakir)
http://physicsnet.co.uk/a-level-phys...oactive-decay/

Use the equations available here and have a go
I've tried it twice and got 7.6x10^11 seconds both times but it days that it is wrong.
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Eimmanuel
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#4
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(Original post by Katie2000)
I've tried it twice and got 7.6x10^11 seconds both times but it days that it is wrong.
Hi, it would be good that you show your working and the number that you use to calculate.
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