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# J.J.Thomson’s cathode ray tube experiment demonstrated that:A. Cathode rays are streams of negatively charged ionsB. All the mass of an atom is essentially in the nucleusC. The $\dfrac{e}{m}$ of electrons is much greater than the $\dfrac{e}{m}$ of protons.D. The $\dfrac{e}{m}$ ratio of the cathode ray particles changes when a different gas is placed in the discharged tube.

Last updated date: 13th Jun 2024
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Hint: J.J Thomson’s is known for Ws famous experiment cathode ray tube which should know that all atoms contain tiny negatively charged subatomic particles or electrons. He also proposed that direction of ratio of $e/m$ vary with charge of use of cathode ray and proton.

In this experiment we had an tube at one end of it, high potential has attached because of which ${{e}^{-}}$ emitted and because of presence of magnets and electric field in tube, we saw deflection on screen, Because of this deflection only, ratio of $e/m$ on screen is a proton. But when he performed with cathode ray, deflection was more & screen went up. This way the ratio of $e/m$ of ${{e}^{-}}$ is much greater than $e/m$ of protons.
Note: Thomson could not explain the stability of structure of atom and atomic spectra. Also he couldn’t show that all the mass contained in atoms is because of the mass of the nucleus only. Therefore, the statement given in option (B) is wrong. Change of ratio of $e/m$ cathode ray particles are independent of changes in gas which is plaid in the discharged tube.