Two radioactive species A, B having No, = 4Nowith half-life periods 3and 9 min respectively. How much time it will take to make N. = N, ?

Two radioactive species A, B having No, = 4Nowith half-life periods 3a

1.	Two radioactive species A, B having No, = 4Nowith half-life periods 3and 9 min respectively. How much time it will take to make N. = N, ?
Answer» tion:Correct option isD2λ1Decay equation is GIVEN by N=Noe−λtWhere, λ is DECAY constant; N is number of atom at time tSo, number of atom of A is given by, NA=Noe−5λtAnd that of B are given by, NB=Noe−λtTaking ration we GET: NBNA=e−4λtGiven that: NBNA=e−2So, this will HAPPEN when, t=2λ1