FlexiQuiz - QUIZ 1- ATOM

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1. The perpendicular distance of the initial velocity vector of the alpha - particle from the central line of the nucleus when the alpha - particle is far away from the nucleus is called ___________

Distance of closest approach

Impact parameter

Size of nucleus

Angle of scattering

2. How will the distance of closest approach be affected when the kinetic energy of the alpha-particle is doubled?

becomes double

can't say

no effect

becomes half

3. In the alpha scattering experiment the distance of closest approach for an α -particle is d₀ . If α -particle is replaced by a proton, how much kinetic energy in comparison to α –particle will it require to have the same distance of closest approach d₀ ?(charge of α –particle is twice of charge on proton)

Twice

half

same

can't say

4. Alpha particle scattering experiment gives the

Upper limit of the size of nucleus

Uper limit of the size of atom

exact size of atom

exact size of nucleus

5. Following points are proposed by Rutherford on the basis of alpha scattering experiment.

Every atom consists of a tiny central core, called nucleus which contains all its positive charge and most of its mass .

The atom mostly consists of empty space.

Atom is electrically neutral, the positive charge on the nucleus is equal to the negative charge on the electrons.

Electrons are not stationary but revolve around the nucleus in circular paths.

All of the above

Angle of scattering is ________________ to the impact parameter.

is greater than

inversely proportional

is equal

directly proportional

7. Most of the alpha - particles pass straight through the Gold foil.This indicates

Atom is electrically neutral, the positive charge on the nucleus is equal to the negative charge on the electrons.

Electrons are not stationary but revolve around the nucleus in circular paths.

The atom mostly consists of empty space.

Every atom consists of a tiny central core, called nucleus which contains all its positive charge and most of its mass

8. Drawbacks of Rutherford model are :

(A) It failed to account for the stability of the atom.

(B) It failed to explain the emission of line spectra of hydrogen atom.

Both (A) and (B)

None of the above

9. Only few alpha - particles were scattered by 90⁰ or more.This indicates

(A) Every atom consists of a tiny central core, called nucleus which contains all its positive charge and most of its mass .

(B) The atom mostly consists of empty space.

Both (A) and (B)

None of the above

10. Famous alpha particle scattering experiment by gold foil is performed by

Geiger and Marsden

Neils Bohr

Rutherford

Benjamin Franklin

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