Surface & Nuclear Chemistry / भूतल और नाभिकीय रसायन
JEE Main & Advanced
Chemistry
Surface & Nuclear Chemistry / भूतल और नाभिकीय रसायन
Question Bank
Rate of decay and Half-life
question_answer
The half-life of the radio element \[_{83}B{{i}^{210}}\] is 5 days. Starting with 20 g of this isotope, the amount remaining after 15 days is [BHU 1987]