The increasing order (lowest first) for the values of $e/m$ (charge/mass) for:

  • A
    $e, p, n, \alpha$
  • B
    $n, p, e, \alpha$
  • C
    $n, p, \alpha, e$
  • D
    $n, \alpha, p, e$

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Radius of the nucleus is equal to $10^{-12} \ cm$ and that of the atom is equal to $10^{-8} \ cm$. What is the fraction of the volume of the atom occupied by the nucleus?

The nucleus of an atom can be assumed to be spherical. The radius of the nucleus of mass number $A$ is given by $1.25 \times 10^{-13} \times A^{1/3} \ cm$. The radius of the atom is $1 \ \mathring{A}$. If the mass number is $64$,then the fraction of the atomic volume that is occupied by the nucleus is:

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The radius of an atom is about

The size of the nucleus is measured in

The neutrino has:

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