Choose the correct statement regarding alpha scattering experiment.

  1. There is no deviation of alpha particle at all
  2. All the alpha particles are deviated by 90° 
  3. Very few of the alpha particles go on straight line
  4. Very few alpha particles are deviated by 90° 

Answer (Detailed Solution Below)

Option 4 : Very few alpha particles are deviated by 90° 
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Detailed Solution

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CONCEPT:

  • Rutherford’s Model of the Atom: He bombarded the beam of alpha particles on a very thin gold foil.

While bombarding he observes the number of scattering of particles:

  • Most of the particles passed either un-deviated or with a very small deviation.
  • Some deviated by large angles
  • 1 out of 8000 was deflected by more than 90°

The conclusion of this deflection:

  • Most of the space of an atom is empty.
  • At the center of an atom having a tiny positively charged particle called a nucleus.
  • The center nucleus has all the mass of an atom.
  • The amount of positive charge at the nucleus is equal to the total amount of negative charges on all the electrons of the atom.
  • All the electrons revolve around the nucleus and coulomb force provides the centripetal force.

EXPLANATION:

  • From the above discussion, we can say that very few alpha particles are deviated by 90°. So option 4 is correct.

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