How to calculate Half-life of radioactive substances.

This video is about how to calculate half-life of radioactive substances.

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[@ntcphysics9407]

Thank you so much all for watching this lesson. More like it are coming soon.

[@huyanhle]

Hi,
Could you please help me with this following question
Radioactive materials are considered to be relatively safe when their activity has fallen below 0.1% of their initial value.
(a) How much half-lives does this take? (Answer = 10 half-lives)
(b) Plutonium-239 is a by product of nuclear reactors. Its half-life is 24 000 years. How long does the plutonium-239 have to be stored as nuclear waste before it is considered safe to handle? (Answer - 240 000 years)

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[@ntcphysics9407]

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[@ntcphysics9407]

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He made a Blunder in Copying the Log Amount 9.30

[@ntcphysics9407]

Hi,
Would you be more specific in pointing out the blander? Or maybe you did not just pay much attention to the explanation.

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Please try to be straight forward

[@ntcphysics9407]

Precious where are you finding difficulties understanding?

[@samuelowolabi3425]

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You are welcome