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Question

Radioactive material 'A' has decay constant '8λ' and material 'B' has decay constant 'λ'. Initially they have same number of nuclei. After what time, the ratio of number of nuclei of material 'B' to that 'A' will be e?

A
19λ
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B
1λ
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C
17λ
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D
18λ
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Solution

The correct option is C 17λ
NA=NAoe(8λ)t
NB=NBoeλt
NAo=NB0
NBNA=e
eλte8λt=e1
e7λt=e1
7λt=1
t=17λ

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