Teaching BPSC बिहार माध्यमिक TGT (9 to 10) शिक्षक भर्ती 4.0 Mock Test Physics Nuclear Physics Radioactivity
The half life of a radioactive substance is 10 years and its initial mass is 1 g. The remaining amount after 20 years is ________.
1
0.25 g
2
1.00 g
3
0.50 g
4
More than one of the above
5
None of the above