1.

The half life of radioactive sodium is 15 hours its disintegration constant is

Answer»

`0.0462 h^(-1)`
`0.0642 h^(-1)`
`0.0462 s^(-1)`
`0.0462 "min"^(-1)`

SOLUTION :`K = (0.693)/(t_(1//2)) = (0.693)/(15) = 0.0462 hr^(-1)`.


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