$\beta=\frac{\Delta I_C}{\Delta I_B}$
$=\frac{7.5 \times 10^{-3}}{100 \times 10^{-6}}$
$\therefore \beta=75$
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$Statement$ $I$ : Most of the mass of the atom and all its positive charge are concentrated in a tiny nucleus and the electrons revolve around it, is Rutherford's model.
$Statement$ $II$ : An atom is a spherical cloud of positive charges with electrons embedded in it, is a special case of Rutherford's model.
In the light of the above statements, choose the most appropriate from the options given below.
