An alpha particle after passing through a potential difference of `2xx10^(6)` volt falls ona silver foil. The atomic number of silver is 47. Calculate (i) the K.E. of the alpha-particle at the time of falling on the foil. (ii) K.E. of the `alpha`-particle at a distance of `5xx10^(-14)m` from the nucleus, (iii) the shortest distance from the nucleus of silver to which the `alpha`-particle reaches.