NEET
- Exam
- NEET
- Subject
- Physics
- Chapter
- Atomic Physics
NEET · Physics · Atomic Physics
Assertion : For the scattering of (α)-particles at a large angles,...
Assertion : For the scattering of (\alpha)-particles at a large angles, only the nucleus of the atom is responsible.
Reason : Nucleus is very heavy in comparison to electrons.
Options
- AIf both assertion and reason are true and the reason is the correctexplanation of the assertion.
- BIf both assertion and reason are true but reason is not the correctexplanation of the assertion.
- CIf assertion is truebutreason is false.
- 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 (\alpha)-particle. Hence electron cannot scatter the (\alpha)-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 (\alpha)-particles.