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The e/m ratio for cathode rays:...

The e/m ratio for cathode rays:

A

Is constant

B

Varies as the atomic number of the element forming cathode in the discharge tube changes

C

Varies as atomic number of the gas in the discharge tube varies

D

Has the smallest value when the discharge tube is filled with hydrogen

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The correct Answer is:
A
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MOTION-ATOMIC STRUCTURE -EXERCISE-1
  1. Cathode rays are

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  2. The e/m ratio for cathode rays:

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  3. Electron, Proton and Neutron were respectively discovered by -

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  4. If W is atomic weight and N is the atomic number of an element, then

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  5. The study of cathode rays (i.e. electronic discharge through gases) sh...

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  6. Which of the following while in motion cannot be deflected by magnetic...

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  7. Rutherford's experiment on the scattering of alpha particle showed for...

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  8. prop-particles are represented by:

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  9. If the I.P. of Li ^(+2)is 122.4 eV. Find out 6 ^(th)I.P. of carbon -

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  10. The energy difference between two electronic states is 46.12 "kcal"//"...

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  11. The correct statement(s) about Bohr’s orbits of hydrogen atom is/are -

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  12. The ratio of E (2) - E(1) to E(4) - E(3) for the hydrogen atom is appr...

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  13. Bohr's model can explain

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  14. When an electron jumps from L to K shell -

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  15. The potential energies of first, second and third Bohr’s orbits of He ...

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  16. The energy of electron in first Bohr's orbit of H-"atom" is - 13.6 eV ...

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  17. The frequency of the strong yellow line in the spectrum of sodium ...

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  18. The spectrum of He is expected to be similar to that of

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  19. Supposing the energy of fourth shell for hydrogen atom is - 50 a.u. (a...

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  20. Supposing the ionization energy of hydrogen atom is 640 eV. Point out ...

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