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5 April, 17:02

A radioactive isotope, Phlebotinum, decays into Dilithium with a half-life of 42 million years. If we find a rock with 25% Phlebotinum to 75% Dilithium, how old is the rock? How do we know?

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  1. 5 April, 18:13
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    time taken for 25% Phlebotinum and 75% Dilithium is 168 million years

    Explanation:

    radioactive isotope of Phlebotinum decays into Dilithium.

    time taken to half life takes = 42 million years

    half life means that the Phlebotinum is 50% and Dilithium is also 50%

    and now it is given that Phlebotinum is 25% and Dilithium is 75%

    hence this condition will come after two half lives.

    for one half life it takes 42 million years

    and for second half life time becomes 4 times of first half life

    time for 25% Phlebotinum and 75% Dilithium is = 4 * 42

    = 168 million years.

    hence time taken for 25% Phlebotinum and 75% Dilithium is 168 million years
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