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In a geiger - marsden experiment. Find t...

In a geiger - marsden experiment. Find the distance of closest approach to the nucleus of a 7.7 me v `alpha`- particle before it comes momentarily to rest and reverses its direction. (z for gold nucleus = 79) .

A

10 fm

B

20 fm

C

30 fm

D

40 fm

Text Solution

Verified by Experts

The correct Answer is:
C
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Knowledge Check

  • (A) most of the mass of the atom is concentrated in its nucleus. (R) all alpha particles striking a gold sheet are scattered in different directions.

    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 both assertion and reason are false.
    • AAKASH SERIES-ATOMS-EXERCISE -II
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    2. Thickness of the foil of gold used in alpha-particle scattering experi...

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    3. In Rutherford's experiment, number of particles scattered at 90^(@) an...

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    4. If an electron in hydrogen atom jumps from third orbit to second orbit...

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    5. An alpha nucleus of energy (1)/(2)mv^(2) bomobards a heavy nuclear tar...

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    6. In Rutherford's alpha particle cexperiment with thin gold faill, 8100 ...

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    7. An alpha particle of energy 5 MeV is scattered through 180^(@) by a fi...

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    8. If the electron in an hydrogen atom jumps from an orbit with level n(f...

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    9. The ratio of the largest to shortest wavelength in Balmer series of hy...

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    10. An electron in a hydrogen atom makes a trsnsition n(1)rarrn(2) where n...

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    11. Light from balmer series of hydrogen is able to eject photoelectron fr...

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    12. A hydrogen atom emits a photon corresponding to an electron transition...

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    13. when an electron jumps from the fourth orbit to the second orbit, one ...

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    14. If the radius of the first Bohr orbit of the H atom is r then for the ...

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    15. The wavelength of first member of Balmer series in hydrogen spectrum i...

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    16. A hydrogen like atom (atomic number Z) is in a higher excited state o...

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    17. Electrons from n = 2 to n= 1 in hydrogen atom is made to fall on a met...

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    18. Let v(1) be the frequency of the series limit of the Lyman series, v(2...

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    19. The transition from the state n = 4 " to " n = 3 in a hydrogen like at...

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    20. Energy required for the electron excitation in Li^(++) from the first ...

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