Assertion (A) : In Rutherford's experiment, `alpha` particles from a radium source
Channel: Doubtnut
Date: 2021-11-02

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.