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(87)^(221) Ra is a radioactive substance...

`_(87)^(221) `Ra is a radioactive substance having half life of `4` days .Find the probability that a nucleus undergoes decay after two half lives

A

`1`

B

`(1)/(2)`

C

`(3)/(4)`

D

`(1)/(4)`

Text Solution

Verified by Experts

The correct Answer is:
b
Radioactive decay is a random process. Each decay is a completely independent event. Therefore, which particular nucleus will decay at a given instant of time cannot be predicted. In other words when a particular nucleus will decay cannot be predicted. Each nucleus has same probability of disintergration.
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