Half life of 60Co is 5.3 yrs, the time taken for 99.9% decay will be:
A radioactive element has a half life of 15 yrs. What is the fraction that will decay in 30 yrs?
Ronith is now 20 yrs old and Isha is 4yrs old. In how many yrs will Ronith be twice as old as Isha?????