Radioactive disintergation always follow `I` order kinetics and is independent of all external factors and is represented by the relation `N = N_(0) e^(-lambda t)` where `lambda` is decay constant and `N` atoms are left at time `t`. The radioactive nature of element is expressed in terms of average life numerically equal to decay constant `(1//lambda)` however all the radioactive do not lose their radioactive nature in thier average life. The radioactive emission involves `alpha, beta` particles as well as `gamma-` rays.The penertrating power order is `alpha lt beta lt gamma`. The emissions can perntrate even thick steel walls but are however unable to penttrate `Pb` blocks. The `S` unit fo rate of decay is `dps`. Report the wrong realation:A. Amount decayed after `n` halves `= (N_(0) [2^(n) -1])/(2)`B. Av. Life `= t_(1//2) xx (1)/(0.693)`C. Fraction of nuclie decayed `= 1 - e^(-lambda t)`D. None of these