Most of the `alpha`-particles passed straight through the gold foil. This proved the existence of in an atom.

When alpha - particles are passed through a thin foil, then

Assertion (A) : In Rutherford's experiment, alpha particles from a radium source were allowed to fall on a 10^(-4)mm thick gold foil. Most of the particles passed straight through the foil. Reason (R) : The entire positive charge and nearly whole of the mass of an atom is concentrated in the nucleus.

In Rutherford's gold foil experiment most of the alpha -particles pass through the gold foil without any deviation from their paths . This indicates that

Most of the alpha -particles passed through the foil undeviated . What can be concluded from this observation ?