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GTLife Puzzle 15

    Great Thinkers Life

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    GTLife Puzzle 15
    Prize: One thousand naira (#1,000) or 2.5 United States Dollars ($2.5) or its equivalent in any other currency.

    A radioactive isotope has half-life of 5 days. Its initial count rate is 1000 counts/seconds. When will the count rate be 3.906 counts/seconds?

    How to Win the Prize:
    (i)Register at
    (ii) Solve the question above.
    (iii) Type or scan or snap your solution.
    (iv) Invite 5 or more persons to register at
    (v) Send your display name, their display names and your solution to

    1. The registration is free.
    1. If you already have an account at you may not need to create a new account for yourself.
    2. Your display name is on the website. You will choose it during the registration. It is your First name and Last name.
    3. Two or more persons can win the prize.

    Deadline: Wednesday, 31st March, 2021


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