1.

The half-life of radioactive sodium is 15.0 hours. How many hours would it taken for 64 gms of sodium to decay one-eighth of its original value

Answer»

3
15
30
45

Solution :`:' 2.303 "log" (No)/(N) = LAMDA t`
and `lamda = (0.693)/(t_(1//2)) = (0.693)/(15)`
or `lamda = 0.0462`
`:.` using equation (i) we GET
`2.303 "log" (64)/(8) = 0.0462 xx t`
or `t = 45`hr


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