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

• A

  All of the $\mathrm{\alpha }$-particles pass through the gold foil without decrease in speed.
• B

  $\mathrm{\alpha }$-particles are deflected over a wide range of angles.
• C

  All $\mathrm{\alpha }$-particles get bounced back by $180°$.
• Correct answer
  D

  $\mathrm{\alpha }$-particles pass through the gold foil deflected by small angles and with reduced speed.

Hence, the correct answer is option: 'D'.