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Number of electrons that constitute one ampere of current is :

A. 265x1016

B. 625x1012

C. 4.8 x 1010

D. 625x1016

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  1. The mass of an electron in motion depends upon:
  2. A proton and an alpha particle having same momentum enter a magnetic field at right angles to it. If r1…
  3. In the lowest orbit, the binding energy of an electron in hydrogen atom is 13.6 eV. The energy required…
  4. In Rutherford experiment the number of a-particles scattered through an angle 60° is 112 per minute,…
  5. An α-particle accelerated through V volt is fired towards a nucleus. Its distance of closest approach…
  6. Number of electrons that constitute one ampere of current is :
  7. Minimum excitation potential of Bohr's first orbit in hydrogen atom is:
  8. It is given for the azimuthal quantum number l = 3, the total number of different possible values of…
  9. Which of the following is incorrect regarding Rutherford's atomic model ?
  10. For electron moving in nth orbit of the atom, the angularvelocity is proportional to :
  11. Atomic hydrogen is excited to the nth energy level. The maximum number of spectral lines which it can…
  12. In terms of Rydberg Constant R, the wave number of the first Balmer line is :
  13. α-particles are projected towards the nuclei of the following metals, with the same kinetic energy.…
  14. The order of size of nucleus and Bohr radius of an atom respectively are:
  15. The velocity of an electron in its fifth orbit, if the velocity of an electron in the second orbit of…
  16. If Bohr's radius is R0 then radius of 3rd orbit of hydrigen atom will be:
  17. The KE of the electron in an orbit of radius r in hydrogen atom is : (e = electronic charge)
  18. The distance of closest approach of an α-particle fired towards a nucleus with momentum p, is r.…
  19. If the electron in a hydrogen atom jumps from an orbit level n1 = 3 to an orbit level n2 = 2, the…
  20. In the lowest energy level of hydrogen atom, electron has the angular momentum:
  21. The mass and energy equivalent to 1 a.m.u. respectively are :
  22. The radius of hydrogen atom, when it is in its second excited state, becomes :
  23. The angular momentum of electron in hydrogen atom is proportional to :
  24. The acceleration of electron in the first orbit of hydrogen atom is: