TS EAMCET 03 May 2019 Shift 1 Solved Paper

An alloy is composed of two radioactive materials A and B having equal weight. The half life of A and B are 10 yrs and 20 yrs respectively. After a time 't', the alloy was found to consist of (

1

e

) kg of 'A' and 1 kg of B. If the atomic weight of A and B are same, then the value of 't' is (Assume ln 2 = 0.7)