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किसी रेडियोएक्टिव पदार्थ कि अर्द्ध-आयु 3 घण्टे है । 9 घण्टो के पश्चात्, इसकी सक्रियता मुलमान का घटाकर रह जाती है :

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किसी रेडियोएक्टिव पदार्थ कि अर्द्ध-आयु 3 घण्टे है । 9 घण्टो के पश्चात्, इसकी सक्रियता मुलमान का घटाकर रह जाती है :
A. `1//9`
B. `1//27`
C. `1//6`
D. `1//8`
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Correct Answer - D
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