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रेडियम की अर्ध्द - आयु 1600 वर्ष हैं । अतः रेडियम के एक नमूने की वह मात्रा जो 6400 वर्ष पश्चात् शेष बचेगी
A. `2//4`
B. `1//2`
C. `1//8`
D. `1//16`

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Correct Answer - D
`N=N_(0)xx((1)/(2))^((6400)/(1600))`
`N=N_(0)xx((1)/(2))^(4)implies N=(N_(0))/(16)`
रेडियम के नमूने की मात्रा `(1)/(16)` भाग शेष बचेगी ।

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