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NEETPhysicsAtomic Physics

Assertion : For the scattering of ( )-particles at a large angles, only the nucleus of the atom is responsible. Reason : Nucleus is very heavy in comparison to electrons.

Options

  1. AIf both assertion and reason are true and the reason is the correctexplanation of the assertion.
  2. BIf both assertion and reason are true but reason is not the correctexplanation of the assertion.
  3. CIf assertion is truebutreason is false.
  4. DIf the assertion and reason both are false.

Correct answer

A. If both assertion and reason are true and the reason is the correctexplanation of the assertion.

Step-by-step solution

We knows that an electron is very light particle as compared to an ( )-particle. Hence electron cannot scatter the ( )-particle at large angles, according to law of conservation of momentum. On the other hand, mass of nucleus is comparable with the mass of a-particle, hence only the nucleus of atom is responsible for scattering of ( )-particles.

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