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- 20 years and 5 years, respectively
- 20 year and 10 years, respectively
- 10 years each
- 5 years each

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Solution

Verified by Toppr

By, λN=R

0.693TN=R

T=0.693NR

For sample S1:

T1=0.693N15

T1=0.693×2N25 ......................eq1,

For sample S2:

T2=0.693N210 ....................eq2,

By dividing eq1 by eq2, we get:

T1T2=41

It is clear that the ratio of half lives of the two samples is 4:1, therefore half lives can be 20 (4k) years and 5 (1k) years respectively.

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