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स्वर्ण के समस्थानिक `._(79)Au^(197)` एवं रजत के समस्थानिक `._(47)Ag^(107)` की नाभिकीय त्रिज्याओं के अनुपात का सन्‍निकाट मान ज्ञात कीजिए।

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`A` द्रव्यमान संख्यावाले नाभिक की त्रिज्या
`R=R_(0)A^(1//3)`
अतः यदि `A_(1)` व `A_(2)` द्रव्यमान संख्या वाले नाभिकों की त्रिज्याएं क्रमशः `R_(1)` व `R_(2)` हो तो
`((R_(1))/(R_(2)))=((A_(1))/(A_(2)))^(1//3)`
(प्रश्नानुसार `A_(1)=197,A_(2)=107`)
`:.(R_(1))/(R_(2))=(197/107)^(1//3)=(1.84)^(1//3)~~1.23`

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