The penetration power of a proton is:

The mass of an electron is ......... compared to the mass of the lightest nucleus.

What is a kernel in the context of atomic structure?

The ratio of the masses of a proton and an electron is:

Proton is

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.