If 75% of any given amount of radioactive element disintegrates in 60 min. The half- life of radioactive element is A) 20 min B) 45 min C) 30 min D) 25 min

If 75% of any given amount of radioactive element disintegrates in 60

1.	If 75% of any given amount of radioactive element disintegrates in 60 min. The half- life of radioactive element is A) 20 min B) 45 min C) 30 min D) 25 min
Answer» 30 min 75 % completion MEANS 2 HALF lifes