Identify the correct increasing order of $e/m$ ratio for the following particles: $n, p, e, \alpha$.

$A$ certain particle carries $2.5 \times 10^{-16} \, C$ of static electric charge. Calculate the number of electrons present in it.

Fill in the blanks:
$(i)$ When amber or ebonite is rubbed with silk or fur,it produces $......$.
$(ii)$ In a discharge tube,the stream of particles flows from cathode to anode. This is called $......$.
$(iii)$ In a cathode ray tube,a coating of $......$ is applied as a fluorescent material.
$(iv)$ $A$ television picture tube is a type of $......$ tube.

Who discovered the neutron?

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

What is a kernel in the context of atomic structure?