Discovery of the Electron

Thomson also showed that the properties of cathode rays remained the same, irrespective of the metal chosen as a cathode.

Thomson by his experiment concluded that electrons are chargeless particles.

Which of the following properties of atom could be explained correctly by the Thomson Model of atom?

In the experiment for the determination of $\frac{e}{m}$ of electrons by the Thomson method, electric and magnetic fields are

In Thomson's mass spectrographs, when an electric field of $2\times {10}^4 \mathrm{V} {\mathrm{m}}^{-1}$ is applied then the deflection produced on the screen is $20 \mathrm{mm}$. If the length of the plates is $5 \mathrm{cm}$ and the distance of the screen from plates is $21 \mathrm{cm}$ and the velocity of positive ions is ${10}^6 \mathrm{m} {\mathrm{s}}^{-1}$, then their specific charge will be:

In Thomson mass spectrograph, singly and doubly ionised particles from similar parabola corresponding to magnetic fields of 0.8 T and 1.2 T for a constant electric field. The ratio of masses of ionised particles will be