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एक पट्टण 1.5xx10^(9) वर्ष पुराणी है तथ...

एक पट्टण `1.5xx10^(9)` वर्ष पुराणी है तथा इसमें `U^(238)` है जो विघटित होकर `Pb^(206)` बनता है मानिए कि प्रारम्भ में चट्टान में कोई `Pb^(206)` नहीं था तथा `U^(238)` के विघटन से यही एक अंतिम स्थायी उत्पाद है चट्टान में `Pb^(206)` व् `U^(238)` के नाभिको कि संख्याओं के वर्त्तमान अनुपात कि गणना कीजिए । `U^(238)` कि अर्द्ध-आयु `4.5xx10^9` वर्ष है। `2^("1/3")=1.259` दिया है :

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