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Q.

A certain radioactive material can undergo three different types of decay, each with a different decay constant λ, 2λ and 3λ. Then, the effective decay constant λeff is given by

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a

1λeff =1λ+12λ+13λ

b

λeff =λ+2λ+3λ

c

λeff=λ+2λ+3λ3

d

1λeff =131λ+12λ+13λ

answer is B.

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Detailed Solution

dNAdt=−λNA+−2λ⋅NA+−3λ⋅NA         =−6λ⋅NA
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