1. The ionisation energy of hydrogen atom is 13.6 eV. Following Bohr’s theory the energy corresponding to a transition between 3rd and 4th orbits is
Q2. Rutherford’s experiments suggested that the size of the nucleus is about
Q3.. In the Geiger-Marsden scattering experiment the number of scattered particles detected are maximum and minimum at the scattering angles respectively at
Q.4. Which of the following series in the spectrum of hydrogen atom lies in the visible region of the electromagnetic spectrum?
Q.5. In a hydrogen atom, which of the following electronic transitions would involve the maximum energy change
Q.6. Hydrogen atom excites energy level from fundamental state to n = 3. Number of spectral lines according to Bohr, is
Q.7. The transition from the state n = 4 to n = 3 in a hydrogen like atom results in ultraviolet radiation. Infrared radiation will be obtained in the transition from
Q.8. For a given value of n, the number of electrons in an orbit is
Q.9. Balmer series lies in which spectrum?
Q.10. In Bohr model of hydrogen atom, let P.E. represents potential energy and T.E. represents the total energy. In going to a higher level.
Q.11. Which of the following statements is correct in case of Thomson’s atomic model?
Q. 12. Which one did Rutherford consider to be supported by the results of experiments in which α-particles were scattered by gold foil?
Q.13. According to the Rutherford’s atomic model, the electrons inside the atom are
Q.14. According to classical theory, the circular path of an electron in Rutherford atom model is
Q.15. Rutherford’s α-particle experiment showed that the atoms have
Q.16. Electrons in the atom are held to the nucleus by
Q.17. The Rutherford α-particle experiment shows that most of the α-particles pass through almost unscattered while some are scattered through large angles. What information does
Q.18. In Rutherford’s α -particle scattering experiment, what will be correct angle for α scattering for an impact parameter b = 0 ?
Q.19. In the ground state in …A… electrons are in stable equilibrium while in …B… electrons always experiences a net force. Here, A and B refer to
Q.20. The significant result deduced from the Rutherford’s scattering experiment is that
Q.21. Electrons in the atom are held to the nucleus by
Q.22. In a Rutherford scattering experiment when a projectile of charge Z1 and mass M1 approaches a target nucleus of charge Z2 and mass M2, the distance of closest approach is r0. The energy of the projectile is
Q.23. According to classical theory, Rutherford’s atomic model is
Q.24. Rutherford’s atomic model was unstable because
Q.25. The electrons of Rutherford’s model would be expected to lose energy because, they
Q.26. As one considers orbits with higher values of n in a hydrogen atom, the electric potential energy of the atom
Q.27. Which of the following parameters is the same for all hydrogen-like atoms and ions in their ground states?
Q.28. The angular speed of the electron in the nth orbit of Bohr hydrogen atom is
Q.29. According to Bohr’s model of hydrogen atom
Q.30. As the quantum number increases, the difference of energy between consecutive energy levels
Q.31. Which of the following in a hydrogen atom is independent of the principal quantum number n? (The symbols have their usual meanings).
Q.32. According to the Bohr theory of H-atom, the speed of the electron, its energy and the radius of its orbit varies with the principal quantum number n, respectively, as
Q.33. In terms of Bohr radius r0, the radius of the second Bohr orbit of a hydrogen atom is given by
Q.34. When hydrogen atom is in its first excited level, it’s radius is
Q.35. The angular momentum of the electron in hydrogen atom in the ground state is
Q.36. When an atomic gas or vapour is excited at low pressure, by passing an electric current through it then
Q.37. The first spectral series was disscovered by
Q.38. When an electron jumps from the fourth orbit to the second orbit, one gets the
Q.39. The Balmer series for the H-atom can be observed
.40. In Balmer series of emission spectrum of hydrogen, first four lines with different wavelength Hα Hβ Hγ and Hδ are obtained. Which line has maximum frequency out of these?
Q.31. In which of the following series, does the 121.5 nm line of the spectrum of the hydrogen atom lie ?
Q.42. Which of the following series in the spectrum of hydrogen atom lies in the visible region of the electromagnetic spectrum?
Q.43. The shortest wavelength in Balmer’s series for Hydrogen atom is …A… and this is obtained by substituting …B … in Balmer’s formula. Here, A and B refer to
Q.44. As an electron makes a transition from an excited state to the ground state of a hydrogen – like atom/ion
Q.45. Bohr’s atom model is the modification of Rutherford’s atom model by the application of
Q.46. In Bohr’s model electrons are revolving in a circular orbits around the nucleus called as
Q.47. According to Bohr’s theory of H atom, an electron can revolve around a proton indefinitely, if its path is
Q.48. According to Bohr the difference between the energies of the electron in the two orbits is equal to
Q.49. The angular momentum of electrons in an atom produces
Q.50. According to Planck’s quantum theory any electromagnetic radiation is