Two radioactive elements R and S disintegrate as
R → P + α; λR = 4.5 × 10–3 years–1
S → P + β; λS = 3 × 10–3 years–1Starting with number of atoms of R and S in the ratio of 2 : 1, this ratio after the lapse of three half lives of R will be :
Options
1. 3 : 2
2. 1 : 3
3. 1 : 1
4. 2 : 1
