90% of a radioactive sample is left unde...

`90%` of a radioactive sample is left undecayed after time `t` has elapesed. What percentage of the initial sample will decay in a total time `2 t` ?

A

`38%`

B

`19%`

C

`9%`

D

`62%`

Text Solution

Verified by Experts

The correct Answer is:

B

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