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    Physics-

    The half-life of radioactive Radon is 3.8 days. The time at the end of which (1/20)th of the Radon sample will remain undecayed is (given open log subscript 10 invisible function application e equals 0.4343 close parentheses

    Physics-General

    1. 13.8 text  days  end text
    2. 16.5 text  days  end text
    3. 33 text  days  end text

    4. 76 days

      Answer:The correct answer is: 16.5 text  days  end text

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