`20%` radioactive sample decay in time t. How much sample decay in time 2t ?
`20%` radioactive sample decay in time t. How much sample decay in time 2t ?
A. `40%`
B. `36%`
C. `44%`
D. `80%`
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Correct Answer - B
`20%` decay in timet
means `80%` remaining , `(N)/(N_(0))= (80)/(100) =(8)/(10)`
In time `2t ((N)/(N_(0))) = ((80)/(100))^(2) = .64`
`rArr 64%` remaining means `36%` deecay.
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