Question

(3) 8a, 7B
(4) 40., 48
6. A radioactive substance has 108 nuclei. Its half
life is 30 s. The number of nuclei left after 15 s
is nearly
(1) 2 x 105
(2) 3 x 10
(3) 7 x 107
(4) 5 x 108
7. A certain stable nucleide, after absorbing a
neutron, emits B-particle and the new nucleide
splits spontaneously into two a-particles. The
nucleide is​

Answer 1

Answer:

The no, of nuclei left after 15s is nearly Get the answers you need, ... A radioactive for the substance has 10^8 nuclei ... t1/2= half life ( Its half life is 30s) ... 0.0231=2.303log(108/108-x