After how many days one-tenth of radon sample remains behind? Half-life of radon is `6.931` days.

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Q 1271180926.     After how many days one-tenth of radon sample remains behind? Half-life of radon is `6.931` days.
A

`0.23 d`

B

`2.3 d`

C

`230 d`

D

`23 d`

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Solution
(Provided By a Student and Checked/Corrected by EXXAMM.com Team)

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