*38. The half-life period of a radioact
substance is 20 days. The time taken for
roo
-th of its original mass to disintegrate is
(1) 58 days
(3) 60 days
(2) 59 days
(4) 61 days
Answers
Answered by
2
Answer:
61 days exam uyg9] é leg k ft I'll ft 7 7
Similar questions