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(A) large angle of scattering of alpha p...

(A) large angle of scattering of alpha particles led to the discovery of atomic nucleus.
(R) entire positive charge of atom is concentrated in the central core.

A

Both 'A' and 'R' are true and 'R' is the correct explanation of 'A'.

B

Both 'A' and 'R' are true and 'R' is not the correct explanation of 'A'

C

'A' is true and 'R' is false

D

'A' is false and 'R' is true

Text Solution

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The correct Answer is:
A
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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.

The entire mass and positive charge of an atom is concentrated into its............

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 ?

What is the positively-charged core in the centre of an atom called?

Assertion: In Rutherford's experiment, a-particles from a sodium source were allowed to fall on a 104 mm thick gold foil. Most of the particles passed straight through the foil. Reason : The entire positive charge and nearly whole of the mass of an atom is concentrated in the nucleus.

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What is the positively-charged particle present in an atom called?

AAKASH SERIES-ATOMS-EXERCISE -IB
  1. The energy of a photon of wavelength lambda is

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  2. (A) bohr model can not be extended to two or more electron atoms. (R...

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  3. (A) large angle of scattering of alpha particles led to the discovery ...

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  4. (A) the trajetory traced by an incident particle depends on the impact...

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  5. Thickness of the foil of gold used in alpha-particle scattering experi...

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  6. In scattering experiment, find the distance of closest approach, if a ...

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  7. According the classical theory of Rutherford's model, the path of elel...

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  8. When an electron of the hydrogen atom jumps from a higher to lower en...

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  9. (A) hydrogen atom consists of only one electron but its emission spect...

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  10. (A) for the scattering of alpha- particles at large angles, only the n...

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  11. Statement-1 : Between any two given energy levels, the number of abosr...

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  12. (A) atoms of each element are stable and emit characteristic spectrum....

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  13. (A) most of the mass of the atom is concentrated in its nucleus. (R)...

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  14. (A) bohr's third postulaate states that the stationary orbits are thos...

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  15. (A) the total energy of an electron revolving in any stationary orbit ...

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  16. (A) in the experiment of alpha particle scattering, extremely thin gol...

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  17. (A) in alpha particle scattering number of alpha paritcle undergoing h...

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  18. (A) electrons int the atom are held due to coulomb forces. (R) the a...

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  19. (A) according to classical electromagnetic theory an accelerated parti...

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  20. Assertion : A laser beam of 0.2 watt power can drill holes through a m...

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