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A radioactive substance decay to 1/5 of ...

A radioactive substance decay to `1/5` of its original value in 56 days. The decay constant is

A

`0.287" day"^(-1)`

B

0.0287 per day

C

2.87 per day

D

28.7 per day

Text Solution

Verified by Experts

The correct Answer is:
B
`lambda =2.303/t log (N_(0)/N)`
`=2.303/56 log (5/1)`
`=0.0287" day"^(-1)`
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