Teaching UP TGT Mock Test Series 2025 General Science Chemistry Radioactivity

एक रेडियोसक्रिय तत्व का T1/2 60 मिनट हैI 3 घंटे के उपरांत शेष मात्रा _____ होगी।

1
17.5% 
2
12.5% 
3
25% 
4
50% 
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