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JEE Main202127 Jul 2021Evening ShiftChemistryStructure of AtomActual

If the Thomson model of the atom was correct, then the result of Rutherford's gold foil experiment would have been:

Options

  1. AAll of the α -particles pass through the gold foil without decrease in speed.
  2. Bα -particles are deflected over a wide range of angles.
  3. CAll α -particles get bounced back by 180 ° .
  4. Dα -particles pass through the gold foil deflected by small angles and with reduced speed.

Correct answer

D. α -particles pass through the gold foil deflected by small angles and with reduced speed.

Step-by-step solution

According to Thomson's plum pudding model, protons are diffused in a positively charged cloud (charge is not centred) and the negatively charged particles are embedded in it. So, the α - particles would deviate by small angles and due to repulsion from protons, their speed would decrease.

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