Find the decay constant of .^(55)Co radi...

Find the decay constant of `.^(55)Co` radio nuclide if its activity is known to decrease `4%` per hour. The decay product is non-radioactive.

`1.1xx10^(-5)s^(-1)`

`1.10xx10^(-2)s^(-1)`

`1.1xx10^(-2)s^(-1)`

`1.09xx10^(-5)s^(-1)`

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