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If half-life of a substance is 3.8 days ...

If half-life of a substance is `3.8` days and its quantity is `10.38 gm`. Then substance quantity remaining left after `19` days will be

A

0.151 g

B

0.32 g

C

1.51 g

D

0.16 g

Text Solution

Verified by Experts

The correct Answer is:
B
No. of half life `=(19)/(3.8)= 5`
`(N)/(N_(0)) = ((1)/(2))^(n) = ((1)/(2))^(5) rArr N= (10.38)/(32) = 0.32g`
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