A radioactive substance decay 25% in 10 minutes . If at start there are `4 xx 10^(20)` atoms present. After how much time will the number of atoms be reduced t0 `10^(20)` atoms? (given In 3=1.098)
a) 10.98 min
b) 21.97 min
c) 48.19 min
d) None of these

Options

A. 10.98 min
B. 21.97 min
C. 48.19 min
D. None of these

Answer

C