engineering recuitment NPCIL Scientific Assistant Physics Mock Test Physics Nuclear Physics Radioactivity

रेडियम का क्षय स्थिरांक प्रति वर्ष 2.772 × 10-4 है। इसकी अर्धायु कितनी होगी?

1
2000 वर्ष
2
1240 वर्ष
3
63 वर्ष
4
2500 वर्ष
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