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Half-life of radioactive sample, when ac...

Half-life of radioactive sample, when activity of material initially was 8 counts and after 3 hours it becomes 1 count is

A

2 hours

B

1 hour

C

3 hours

D

4 hours

Text Solution

Verified by Experts

The correct Answer is:
B
`R_(0) = 8, R=1, t= 3hr`
`(R)/(R_(0)) = ((1)/(2))^(n) rArr (1)/(8) = ((1)/(2))^(n) rArr n= 3`
Now, `(t)/(T_(1//2)) = 3 rArr T_(1//2) = (3)/(3) =1` hr
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