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Assertion: For the scattering of alpha-p...

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.

A

If both assertion and reason are true and reason is the correct explanation of assertion.

B

If both assertion and reason are true but reason is not the correct explanation of assertion.

C

If assertion is true but reason is false

D

If assertion is false but reason is true.

Text Solution

Verified by Experts

The correct Answer is:
B
(b) An electron is very light particle as compared to `alpha-`particle. Hence `e^-` 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 `alpha-`particle, hence only the nucleus of atom is responsible for scattering of `alpha-`particle.
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Knowledge Check

  • The particles present in the nucleus of an atom are

    A
    the proton and the electron
    B
    the electron and the neutron
    C
    neutrons and positrons
    D
    the proton and the neutron

  • The particles present in the nucleus of an atom are-

    A
    the proton and the electron
    B
    the electron and the neutron
    C
    the proton and the neutron
    D
    none of these

  • Which of these particles are present in the nucleus of an atom?

    A
    Proton and neutron
    B
    Electron and proton
    C
    Neutron and electron
    D
    Electron, neutron and proton