Initially only radioactive element \( \mathrm{A} \) is present, which disintegrated into another....

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Initially only radioactive element \( \mathrm{A} \) is present, which
\( \mathrm{P} \)
disintegrated into another stable element B. After 6 hours the ratio of atoms of \( \mathrm{A} \) and \( \mathrm{B} \) is found to be \( 1: 7 \).
W
Half-life of A is hours.


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