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Statement -1 : Large angle scattering of...

Statement -1 : Large angle scattering of alpha particles led to the discovery of atomic nucleus.
Statement -2 : Entire positive charge of atom is concentrated in the central core.

A

Statement-1 is true, Statement-2 is true and Statement-2 is correct explanation of Statement-1.

B

Statement-1 is true, Statement-2 is true, but Statement-2 is not a correct explanation of Statement-1.

C

Statement-1 is true, but Statement-2 is false

D

Statement-1 is false, but Statement-2 is true.

Text Solution

Verified by Experts

The correct Answer is:
A
Both the statement are correct, and the latter is a correct explantion of the former.
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Large angle scattering of alpha- particle led Rutherford to the discovery of atomic nucleus. It is the tiny central core of every atom in which entire positive charge of the atom is concentrated. The distance of closet approach of alpha particle from the nucleus is r_(theta)=((Ze)(2e))/(4pi epsilon_(theta)((1)/(2)mv^(2))) This distance r_(theta) gave him the order of size of nucleus. Read the above passage and answer the followign question: (i) What is the distance of closet approach of an alpha particle of energy 7.7 MeV from gold nucleus (z=79)? (ii) What is the implication of this relation in day to day life?

For scattering of alpha -particles at large angles, only the nucleus of the atom is responsible, explain why?

Statement -I : When projected to words towards as atoms having heavy nucleus , most of the alpha particle will pass through it without appereciable decviation. ltbr. Statement -II : All the positive charge of atom is located in a small dense located at center.

Rutherford's alpha -particle scattering experiment showed that (i) electrons have negative charge. (ii) the mass and positive charge of the atom is concentrated in the nucleus. (iii) neutron exists in the nucleus. (iv) most of the space in atom is empty. Which of the above statements are correct ?

Statement-1: Impact parameter for scattering of alpha particles by 180^(@) is zero. Statement-2 : Zero impact parameter means alpha particle tends to hit the centre of the nucleus

Assertion (A) : In Rutherford's experiment, alpha particles from a radium source were allowed to fall on a 10^(-4)mm thick gold foil. Most of the particles passed straight through the foil. Reason (R) : The entire positive charge and nearly whole of the mass of an atom is concentrated in the nucleus.

Statement-1: Distance of closest approach of alpha particle to the nucleus is always greater than the size of the nucleus. Statement-2: Strong nuclear repulsion does not allow alpha particle to reach the surface of nucleus.

According to Thomson's model, every atom consists of a positively charged sphere of radius 10^(-10)m in which entire mass and positive charge of the atom are uniformly distributed. Inside the sphere, electrons are embedded like seeds in a watermelon. According Rutherford, entire positive charge and mass of the atom are concentrated in a tiny central core of the atom, which is called atomic nucleus. Size of nucleus ~~10^(-15)m . The nucleus contains proton and neutrons. Negatively charged electrons revolve around the nucleus in circular orbits. Large angle scattering of alpha -particle could not be explained by

PRADEEP-ATOMS AND NUCLEI-Exercise
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  4. Assertion : In a radioactive disintegration, an electron is emitted by...

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  5. Assertion : Fragments produced in the fission of U^(235) are active. ...

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  6. Electron capture occurs more often than positron emission in heavy ele...

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  7. Assertion : An electron and positron can annihilate each other creatin...

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  8. Assertion: Forces acting between proton-proton (f(pp)), proton -neutro...

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  9. Statement -1 : Large angle scattering of alpha particles led to the di...

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  10. Statement-1: Impact parameter for scattering of alpha particles by 180...

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  11. Statement-1: Distance of closest approach of alpha particle to the n...

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  12. Statement-1: Nuclei of different atom have same size Statement-2: R=...

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  13. Statement-1: Density of nuclear matter is same for all nuclei Statem...

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  14. Statement-1: 1am u.=933MeV Statement-2: It follows form E=mc^(2)

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  15. Statement -1: One kg of coal, on burning, produces energy =10^(7)"joul...

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  16. Statement-1: After ten half life lives, the amount of a radioactive el...

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  17. Statement-1: No law is violated in the nuclear reaction .(0)n^(1)to.(1...

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  18. Statement-1: Half life of tritium is 12.5 yr. The fraction of tritium ...

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  19. This question contains Statement - 1 and Statement -2 Of the four choi...

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  20. Statement-1:A nucleus having energy E(1) decays by beta^(-) emission t...

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