16 g of radioactive radon is kept in a container. How much radon will disintegrate in 19 days? Half life of radon is 3.8 days.
15.5 g
Number of half lives in 19 days is
n=19 days3.8 days=5
∴ Number of atoms left undecayed aftr 19 days is
N=N0(12)5=N032=16 g32=0.5g
Hence the correct choice is (d).