The radius of an atom is about

Cathode rays are

The discovery of the nucleus of an atom was due to the experiment carried out by

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.

Calculate the ratio of the diameter of an atom to the diameter of its nucleus.

What is the ratio of the mass of a proton to the mass of an electron?