A sample contains radioactive atoms of two types, A and B. Initially there are five times as many A atoms as there are B atoms. Two hours later, the numbers of the two atoms are equal. The half-life of A is 0.67 hours. Part A What is the half-life of B? Express your answer using two significant figures. Η ΜΕ ΑΣΦ (t1/2)B = Submit Request Answer ? hours