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JEE Advanced Model Paper 7 with solutions for online practice

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Question : 1

Total: 66

Nucleus A decays to B with decay constant λ1 and B decays to C with a decay constant λ2 . Initially at t = 0 number of nuclei of A and B are 2N0 and N0 respectively . At t = t0 , number ofnuclei B stop changing. If at this instant number of nuclei of B are

, then

t0 =
1
λ1
lne(
4λ1
3λ2
)
t0 =
1
λ2
lne(
4λ1
3λ2
)
NA =
3N0
2
(
λ2
λ1
) at t = t0
NA =
2N0
3
(
λ2
λ1
) at t = t0

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