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slamgirl [31]
4 years ago
5

How long will it take for a radioactive isotope with a decay constant of 0.15 (which means a half life of 4.6 days ) to decay to

5% of its original value?
Physics
1 answer:
jek_recluse [69]4 years ago
6 0
Radioactive decay is given by:
N = No x e^(-λt)
We know that N/No has to be 0.05
λ = 0.15
0.05 = e^(-0.15t)
t = ln(0.05)/(-0.15)
t = 19.97 days
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(B) 62,720 poeple

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extension of the sling shot (e) = 4 m

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spring constant (k) = ?

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rearranging the above equation

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