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एक रेडियोएक्टिव तत्व कि अर्द्ध - आयु 10 वर्ष तथा प्रारंभिक मात्रा 1 ग्राम है । 20 वर्ष पश्चात् इसकी शेष मात्रा होगी :

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एक रेडियोएक्टिव तत्व कि अर्द्ध - आयु 10 वर्ष तथा प्रारंभिक मात्रा 1 ग्राम है । 20 वर्ष पश्चात् इसकी शेष मात्रा होगी :
A. 0.25 ग्राम
B. 0.50 ग्राम
C. 0.75 ग्राम
D. 1.00 ग्राम
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Correct Answer - A
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