`alpha`-particles of enegry `400 KeV` are boumbardel on nucleus of `._(82)Pb` . In scattering of `alpha`-particles, it minimum distance from nucleus will be

When an alpha particle is emitted from a nucleus, its

The ration of mass of an alpha particle to the mass of a deuterium nucleus is

The distance of closet approch of an alpha - particle fired towards a nucleus with momentum p , is r. If the momentum of the alpha - particle is 2p , the corresponding distance of closest apporach is

A nucleus of lead Pb_(82)^(214) emits two electrons followed by an alpha particle. The resulting nucleus will have

In Rutherford experiment alpha – particles are scattered by nucleus having change 100 e^(-) Initial kinetic energy of alpha - particles is 6 MeV . The size of the nucleus is