1.

The half life of radium is 1620 years and its atomic weight is 226 kg per kilomol. The number of atoms that will decay from its 1 g sample per second will be :

Answer»

`3.61 xx 10^(10)`
`3.61 xx 10^(12)`
`3.11 xx 10^(15)`
`3.11 xx 10^(16)`

SOLUTION :Number of atoms that will decay per second
`=lambdaN=(0.693)/(T_(1//2))N`
`=(0.693)/(1620 xx 365 xx 86400) xx (6.02 xx 10^(23))/(226)`
`=3.61 xx 10^(10)`


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