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A radio-active substance has a half lif...

A radio-active substance has a half life of six months. Three - fourth of the substance will decay in _______

A

Six months

B

Ten months

C

Twelve Months

D

Twenty four months

Text Solution

Verified by Experts

The correct Answer is:
C
As per the question, the half life of radioactive substance is 6 months. This means that half of the substance will disintegrate in 6 months. After the decay of the substance, only 50% of it remains. The half of the remaining substance (`(1)/(2)` th of the original substance) will then decay in another 6 months. So, three fourth or 75% or the substance will decay in 12 months of time .
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