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The half life period of a radioactive el...

The half life period of a radioactive element is 90 minutes. What percentage of radioactive element will be present after 6 hours of decomposition ?

A

`25%`

B

`6.25%`

C

`50%`

D

`12.5%`

Text Solution

Verified by Experts

The correct Answer is:
B
6 hours =360 min = 4 half lives
Amount left after 4 half lives `=(N_(0))/(2^(n))=(1)/(16) N_(0)`
`=6.25% " of "N_(0)`
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