NEET Class neet Answered
please answer this
Asked by Prashant DIGHE | 10 Jan, 2020, 10:06: PM
Expert Answer
We have equation for radioactivity :- N = No e-λt .................(1)
after t = 1 day, N = 0.9 No , hence we get , e-λ = 0.9 ...................(2)
after t = 2 day, N/ No = e-2λ ...................(3)
using eqn.(2), eqn.(3) is written as, N/No = [ e-λ ]2 = 0.9 × 0.9 = 0.81
Hence after 2 days, percentage of undecayed nuclei is 81 %
Answered by Thiyagarajan K | 10 Jan, 2020, 10:39: PM
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