1.

""_(87)^(221)Ra undergoes radioactive decay with half life 4 days. What is the probablity that a nucleus undergoes decay in two half-lives:

Answer»

1
`1//2`
`3//4`
`1//4`

SOLUTION :Required probability `=1-e^(-lambdat)=1-e^((-lambda) (2T))`
`=1-e^((-LN 2)/(T).2T)=1-e^(-2 ln 2)`
`=1-1/4=3/4`


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