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A certain mass of radium is reduced by 7...

A certain mass of radium is reduced by 70% in 2780 years. The decay constant is

A

`4.3 xx10^(-4)` per year

B

`3.4 xx10^(-4)` per year

C

`5.4 xx10^(-4)` per year

D

`4.8 xx10^(-4)` per year

Text Solution

Verified by Experts

The correct Answer is:
A
`lambda=2.303/t "log" N_(0)/N`
`=2.303/2780 log 3.333`
`=(2.303xx0.5228)/2780`
`=4.33xx10^(-4)` per year
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