6.The lines of Paschen series are obtained for transition of electrons from higher orbits to the orbit quantum number

7.The electron in a hydrogen atom makes a transition from an exited state to the ground state. Then (a) its kinetic energy increases (b) its potential energy decreases (c) its angular momentum increases (d) its linear momentum increases. Which of the above statements are correct

8.In hydrogen atom, the radii of the first four electron orbits are in the ratio of

9.When the wavelength of Balmer first line is 6563 Å, the wavelength of second line is

10.The second line of Balmer series in the hydrogen spectrum occurs due to the transition of electrons form the