J.J. Thomson's cathode ray tube experiment demonstrated that:

Options

Acathode rays are streams of negatively charged ions
Ball the mass of an atom is cssentially in the nucleus
Cthe $e / m$ of electrons is much greater than the $e / m$ of protons
Dthe $\mathrm{e} / \mathrm{m}$ ratio of the cathode-ray particle changes when a different gas is placed in the discharge tube

Correct answer

C. the $e / m$ of electrons is much greater than the $e / m$ of protons

Step-by-step solution

\left(\frac{e}{m}\right)_{\text{clectron }} \gg\left(\frac{e}{m}\right)_{\text{proton }} \left[\because\left(\frac{e}{m}\right)_{\mathrm{protons}}=\frac{1}{1837}\left(\frac{e}{m}\right)_{\text{electron }}\right]

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