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Railways NTPC (Technical Ability) Power Plant Engineering Question Bank Power Plant Engineering

  • question_answer
    The half-life of radioactive radon is 3.8 days. The time at the end of which l/20th of the Radon sample will remain undecayed will be:

    A) 3.8 days                       

    B) 16.5 days

    C) 33 days            

    D) 76 days

    Correct Answer: B

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