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
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2
Answer:
30 min 75 % completion means 2 half lifes
Answered by
1
75/100=3/4
25%=60/3=20minutes
Half life =20+20=40
25%=60/3=20minutes
Half life =20+20=40
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