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

J.J. Thomson's cathode ray tube experiment demonstrated that:
  1. cathode rays are streams of negatively charged ions
  2. all the mass of an atom is cssentially in the nucleus
  3. the $e / m$ of electrons is much greater than the $e / m$ of protons
  4. the $\mathrm{e} / \mathrm{m}$ ratio of the cathode-ray particle changes when a different gas is placed in the discharge tube

Solution

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

Asked in: NEET 2003

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