What are stationary orbits?

In the given figure for the stationary orbits of the hydrogen atom, mark the transitions representing the Balmer and Lyman series.

State the basic postulates of Bohr’s atomic model. Find the relation for total energy of electron in nth Bohr’s stationary orbit.

Bohr model is a system consisting of small, dense nucleus surrounded by orbiting electrons. The electrons travel is defined circular orbits around the nuclues which orbital angular moementum is an integral multiple of h/(2pi) . While rotating in allowed orbits (stationary orbits) the electron does not radiate energy. electromagnetic radiations are emitted when the electron jumps from a higher orbit (E_(ni)) to a lower orbit (E_(nf)) . The total energy of the electron in an atom is negative. It suggests that

Show that de-Broglie hypothesis of matter wave supports the Bohr's concept of stationary orbit.

If radius of second stationary orbit (in Bohr's atom) is R then radius of third orbit will be :

State Bohr’s postulates for atomic model and using them derive an expression forthe total energy of an electron revolving in a stationary nth orbit of hydrogen atom.

What are standing waves or stationary waves?Why are they so called?