Wb Jee
Radioactivity And Nuclear Chemistry
WB JEE 2019
MCQ+1 / -0.332019
\(_{53}{I^{125}}\) এর অর্ধায়ু হল 60 দিন। 180 দিন পরে ইহার তেজস্ক্রিয়তা হবে -
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