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When alpha particle are sent through a ...

When alpha particle are sent through a thin metal foil ,most of them go straight through the foil because

A

alpha particle are much heavier than electrons

B

alpha particles are positively charged

C

most part of the atom is empty space

D

alpha particle move with high speed

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The correct Answer is:
A, C
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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.

ALLEN-ATOMIC STRUCTURE-Exercise - 01
  1. Which is true about an electron-

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  2. An isotone of .(32)^(76)Ge is-

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  3. When alpha particle are sent through a thin metal foil ,most of the...

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  4. Many elements have non-integral atomic masses because

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  5. The MRI (magnetic resonance imaging) body scanners used in hospitals o...

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  6. Photon of which light has maximum energy :

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  7. The value of Planck's constant is 6.63 xx 10^-34 Js. The velocity of l...

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  8. Bohr's theory is not applicable to-

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  9. What is likely to be principal quantum number for a circular orbit of ...

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  10. Which is the correct relationship-

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  11. If the value of E=-78.4 "kcal//mol", the order of the orbit in hydroge...

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  12. If velocity of an electron in 1st orbit of H atoms is V , what will b...

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  13. In a certain electronic transition in the hydrogen atoms from an init...

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  14. Match the following - {:((a),"Energy of ground state of" He^(+),(i)...

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  15. The energy of hydrogen atom in its ground state is -13.6 eV. The ener...

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  16. Total no of lines in Lyman series of H spectrum will be- (where n=n...

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  17. The spectrum of He is expected to be similar to.

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  18. What possibly can be the ratio of the de Broglie wavelength for two el...

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  19. The uncertainty in momentum of an electron is 1 xx 10^-5 kg - m//s. Th...

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  20. An alpha-"particle" is accelerated through a potential difference of V...

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