What are the elliptical orbits proposed by Sommerfeld ?

Draw the diagram showing the elliptical orbits proposed by Sommerfeld for N- shell (n = 4).

How many elliptical orbits are added by Sommerfeld in third Bohr's orbit? What was the purpose of adding these elliptical orbits ?

Who introduced elliptical orbits ?

How many elliptical orbits are added to Bohr's first circular orbit by Sommerfeld ?

Elliptical orbits were introduced by……….

For a given circular orbits, number of elliptical orbits possible are

How many elliptical orbits are possible for a given n = 6?