Rutherford's scattering experiment is related to the size of the

Are neutrons present in all atomic nuclei? Explain.

Which of the following statements is correct about the cathode rays?
$1$. These rays start from anode and move towards cathode.
$2$. They are visible with human eye.
$3$. In presence of electric and magnetic fields,they behave like positively charged particles.
$4$. Their characteristic does not depend on the nature of material at electrode.

The mass of the proton is $1840$ times that of the electron. If the potential difference applied is $V$,the kinetic energy of the proton is ............ $KeV$.

Which of the following will not show deflection from the path on passing through an electric field?

Provide general information about the fundamental particles of an atom.