Question:
A 280 days old radioactive substance shows an activity of
Last updated: 6/4/2023
A 280 days old radioactive substance shows an activity of 6000 dps 140 days later it s activity becomes 3000dps What was its initial activity A 20000 dps C 12000 dps B 24000 dps D 6000 dps 2004 100